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Prithika
Subject: Maths
, asked on 23/5/18
4th.q
$\mathbf{4}\mathbf{.}\mathrm{If}\mathrm{x},\mathrm{y},\mathrm{z}\mathrm{are}\mathrm{in}\mathrm{A}.\mathrm{P}.\mathrm{then}\mathrm{the}\mathrm{value}\mathrm{of}\left(\mathrm{x}+\mathrm{y}-\mathrm{z}\right)\left(\mathrm{y}+\mathrm{z}-\mathrm{x}\right)\mathrm{is}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{A}\right)8\mathrm{yz}-3{\mathrm{y}}^{2}-4{\mathrm{z}}^{2}\left(\mathrm{B}\right)4\mathrm{xz}-3{\mathrm{y}}^{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)8\mathrm{xy}-4{\mathrm{x}}^{2}-3{\mathrm{y}}^{2}\left(\mathrm{D}\right)10\mathrm{xz}-3{\mathrm{x}}^{2}-3{\mathrm{z}}^{2}$
$\mathbf{4}\mathbf{.}\mathrm{If}\mathrm{x},\mathrm{y},\mathrm{z}\mathrm{are}\mathrm{in}\mathrm{A}.\mathrm{P}.\mathrm{then}\mathrm{the}\mathrm{value}\mathrm{of}\left(\mathrm{x}+\mathrm{y}-\mathrm{z}\right)\left(\mathrm{y}+\mathrm{z}-\mathrm{x}\right)\mathrm{is}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{A}\right)8\mathrm{yz}-3{\mathrm{y}}^{2}-4{\mathrm{z}}^{2}\left(\mathrm{B}\right)4\mathrm{xz}-3{\mathrm{y}}^{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)8\mathrm{xy}-4{\mathrm{x}}^{2}-3{\mathrm{y}}^{2}\left(\mathrm{D}\right)10\mathrm{xz}-3{\mathrm{x}}^{2}-3{\mathrm{z}}^{2}$
Answer
1
Prithika
Subject: Maths
, asked on 23/5/18
Q.2. The sum of n terms of 2 arithmetic progressions are in the ratio of (7n + 1) : (4n + 27). The ratio of their
${11}^{th}$
terms is
(A) 148 : 111
(B) 111 : 148
(C) 111 : 148
(D) 148 : 121
Answer
2
Prithika
Subject: Maths
, asked on 23/5/18
10th q
10.
If a
_{1}
, a
_{2}
, a
_{3}
........................... is an A.P. such that a
_{1}
+ a
_{5}
+ a
_{10}
+ a
_{15}
+ a
_{20}
+ a
_{24}
= 225, then a
_{1}
+ a
_{2}
+ a
_{3}
+ .... + a
_{23}
+ a
_{24}
is equal to
(A) 909 (B) 75
(C) 750 (D) 900
Answer
1
Prithika
Subject: Maths
, asked on 23/5/18
16
Answer
1
Prithika
Subject: Maths
, asked on 23/5/18
29
29.
A man arranges to pay off a debt of Rs. 3600 by 40 annual instalments which are in A.P. When 30 of the instalments are paid, he dies leaving one- thirds of the debt unpaid. Find the value of the 8
^{th}
instalment.
Answer
1
Prithika
Subject: Maths
, asked on 23/5/18
Q.28. 150 workers were engaged to finish a piece of work in acertain number of days. Four workers dropped the second day, four workers deopped the third day and so on, it takes 8 more days to finish the work now. Find the number of days in which the work was completed.
Answer
1
Prithika
Subject: Maths
, asked on 23/5/18
26 th
Q.26. If the pth term of an A.P. is a and qth term is b, show that the sum of (p + q) terms is
$\frac{p+q}{2}\left[a+b+\frac{a-b}{p-q}\right]$
Answer
2
Prithika
Subject: Maths
, asked on 23/5/18
23rd q
Answer
1
Sannidhya Mate
Subject: Maths
, asked on 22/5/18
Please help
Q. Find the sum of
$1.{10}^{1}+2.{10}^{2}+3.{10}^{3}+......99.{10}^{99}$
Answer
2
Sannidhya Mate
Subject: Maths
, asked on 21/5/18
$Ifa,bandcareinAPthena+\frac{1}{b},b+\frac{1}{ca},c+\frac{1}{ab}arein\phantom{\rule{0ex}{0ex}}\left(a\right)AP\left(b\right)GP\phantom{\rule{0ex}{0ex}}\left(c\right)HP\left(d\right)Noneofthese$
Answer
1
Bhavya Biswas
Subject: Maths
, asked on 20/5/18
Write the sequence with nth term
An =6-n
Answer
2
Prithika
Subject: Maths
, asked on 19/5/18
Q2
Answer
2
Siddharth
Subject: Maths
, asked on 16/5/18
Ans it
Answer
1
Sannidhya Mate
Subject: Maths
, asked on 16/5/18
The product of first 5 terms of a geometric progression is 32.if the fourth term is 17 compute the 2nd term
Answer
2
Sannidhya Mate
Subject: Maths
, asked on 16/5/18
the product of first 5 terms of a geometric progression is 32
Answer
1
1
2
3
4
5
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$\mathbf{4}\mathbf{.}\mathrm{If}\mathrm{x},\mathrm{y},\mathrm{z}\mathrm{are}\mathrm{in}\mathrm{A}.\mathrm{P}.\mathrm{then}\mathrm{the}\mathrm{value}\mathrm{of}\left(\mathrm{x}+\mathrm{y}-\mathrm{z}\right)\left(\mathrm{y}+\mathrm{z}-\mathrm{x}\right)\mathrm{is}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{A}\right)8\mathrm{yz}-3{\mathrm{y}}^{2}-4{\mathrm{z}}^{2}\left(\mathrm{B}\right)4\mathrm{xz}-3{\mathrm{y}}^{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)8\mathrm{xy}-4{\mathrm{x}}^{2}-3{\mathrm{y}}^{2}\left(\mathrm{D}\right)10\mathrm{xz}-3{\mathrm{x}}^{2}-3{\mathrm{z}}^{2}$$\mathbf{4}\mathbf{.}\mathrm{If}\mathrm{x},\mathrm{y},\mathrm{z}\mathrm{are}\mathrm{in}\mathrm{A}.\mathrm{P}.\mathrm{then}\mathrm{the}\mathrm{value}\mathrm{of}\left(\mathrm{x}+\mathrm{y}-\mathrm{z}\right)\left(\mathrm{y}+\mathrm{z}-\mathrm{x}\right)\mathrm{is}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{A}\right)8\mathrm{yz}-3{\mathrm{y}}^{2}-4{\mathrm{z}}^{2}\left(\mathrm{B}\right)4\mathrm{xz}-3{\mathrm{y}}^{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)8\mathrm{xy}-4{\mathrm{x}}^{2}-3{\mathrm{y}}^{2}\left(\mathrm{D}\right)10\mathrm{xz}-3{\mathrm{x}}^{2}-3{\mathrm{z}}^{2}$

(A) 148 : 111

(B) 111 : 148

(C) 111 : 148

(D) 148 : 121

10._{1}, a_{2}, a_{3}........................... is an A.P. such that a_{1}+ a_{5}+ a_{10}+ a_{15}+ a_{20}+ a_{24}= 225, then a_{1}+ a_{2}+ a_{3}+ .... + a_{23}+ a_{24}is equal to(A) 909 (B) 75

(C) 750 (D) 900

29.^{th}instalment.Q.26. If the pth term of an A.P. is a and qth term is b, show that the sum of (p + q) terms is $\frac{p+q}{2}\left[a+b+\frac{a-b}{p-q}\right]$

Q. Find the sum of

$1.{10}^{1}+2.{10}^{2}+3.{10}^{3}+......99.{10}^{99}$

An =6-n