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Nura Mohammad
Subject: Maths
, asked on 1/12/17
Ncert class 11 pg 192 question 8 . As rhe value of root 3>1 how can sn be as shown n d photo plz reply asap
Answer
2
Queens Land
Subject: Maths
, asked on 29/11/17
Pl tell the answer and reason
Q). Complete the series given below.
3, 7, 15, 35, 91, ?
A. 99
B. 255
C. 258
D. 302
E. None of these
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 25/11/17
Pls ans question no 2
Q2. If H
_{1}
, H
_{2}
........., H
_{2010}
are "2010" harmonic means between a and b (
$\ne $
a) , then value of
$\frac{{\mathrm{H}}_{1}+\mathrm{a}}{{\mathrm{H}}_{1}-\mathrm{a}}+\frac{{\mathrm{H}}_{2010}+\mathrm{b}}{{\mathrm{H}}_{2010}-\mathrm{b}}$
is equal to
(A) 2011 (B) 2012
(C) 4020 (D) 4024
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 25/11/17
if a,b,c are the pth,qth,rth term respectively of a GP, then (q-r) log a + (r-p) log b + (p-q) log c is equal to (its a numerical based question)
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 25/11/17
a,b,c are sides of a triangle and are in GP. if log a - log 2b, log 2b -log 3c and log 3c - log a are in AP then
A)angle A must be obtuse B) angle B must be obtuse
C) C=90 degree D) none of these
pls give the full solution and not only the option
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 25/11/17
if A be the AM and G be the GM between two numbers, show that the numbers are given by A + or - sqrt (A^2 - G^2).
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 25/11/17
Please ans question no 9
$9.Thesumof\frac{7}{2\times 3}\left(\frac{1}{3}\right)+\frac{9}{3\times 4}{\left(\frac{1}{3}\right)}^{2}+\frac{11}{4\times 5}{\left(\frac{1}{3}\right)}^{3}+...upto10termsisequalto\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(A\right)\frac{1}{2}-\frac{1}{12\times {3}^{10}}\left(B\right)\frac{1}{3}-\frac{1}{12\times {3}^{10}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(C\right)\frac{1}{2}-\frac{1}{10\times {3}^{10}}\left(D\right)noneofthese$
Answer
1
Vibhansh Agarwal
Subject: Maths
, asked on 21/11/17
if a,b,c are in AP and p is the AM between a and b, and q is the AM between b and c, show that b is the AM between p and q
Answer
1
Priyanka
Subject: Maths
, asked on 18/11/17
Q. Prove that
${3}^{\frac{1}{2}}\times {3}^{\frac{1}{4}}\times {3}^{\frac{1}{8}}....=3$
Q. Let x = 1+ a+a
^{2}
+ .... and y = 1+b+b
^{2}
+..., where |a|
$<$
1 and |b|
$<$
1. Prove that
$1+ab+{a}^{2}{b}^{2}+....=\frac{xy}{x+y-1}$
Answer
1
Ipsita Dash
Subject: Maths
, asked on 18/11/17
The number of terms common between the sequences 1,3,9,.....upto 90 terms and 1,5,9,..... upto 90 terms is ??
Answer
2
Ipsita Dash
Subject: Maths
, asked on 18/11/17
In a triangle the lengths of the two larger sides are 10 and 9 units respectively. If the angles are in AP , then the length of the third side.
Answer
1
Ruba Balu
Subject: Maths
, asked on 13/11/17
how did that step occur. that -1 is also root.
Answer
1
Ruba Balu
Subject: Maths
, asked on 12/11/17
20
Q20. Let a , b , c , d be in GP , then show that (a – b)
^{2}
, (b – c)
^{2 }
, (c – d)
^{2}
are in GP.
Answer
1
Ruba Balu
Subject: Maths
, asked on 12/11/17
18
Q18. Find the least value of n for which 1 + 3 + 3
^{2}
+
^{ ....}
...... .......
_{+ +}
3
^{n – 1}
> 1000 .
Answer
1
Ruba Balu
Subject: Maths
, asked on 12/11/17
16. If the
${p}^{th},{q}^{th},{r}^{th}$
terms of an AP are in GP, prove that the common difference is
$\frac{q-r}{p-q}$
Answer
1
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What are you looking for?

Q). Complete the series given below.

3, 7, 15, 35, 91, ?A. 99

B. 255

C. 258

D. 302

E. None of these

Q2. If H

_{1}, H_{2}........., H_{2010}are "2010" harmonic means between a and b ($\ne $ a) , then value of $\frac{{\mathrm{H}}_{1}+\mathrm{a}}{{\mathrm{H}}_{1}-\mathrm{a}}+\frac{{\mathrm{H}}_{2010}+\mathrm{b}}{{\mathrm{H}}_{2010}-\mathrm{b}}$ is equal to(A) 2011 (B) 2012

(C) 4020 (D) 4024

A)angle A must be obtuse B) angle B must be obtuse

C) C=90 degree D) none of these

pls give the full solution and not only the option

$9.Thesumof\frac{7}{2\times 3}\left(\frac{1}{3}\right)+\frac{9}{3\times 4}{\left(\frac{1}{3}\right)}^{2}+\frac{11}{4\times 5}{\left(\frac{1}{3}\right)}^{3}+...upto10termsisequalto\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(A\right)\frac{1}{2}-\frac{1}{12\times {3}^{10}}\left(B\right)\frac{1}{3}-\frac{1}{12\times {3}^{10}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(C\right)\frac{1}{2}-\frac{1}{10\times {3}^{10}}\left(D\right)noneofthese$

Q. Let x = 1+ a+a

^{2}+ .... and y = 1+b+b^{2}+..., where |a| $<$ 1 and |b| $<$ 1. Prove that$1+ab+{a}^{2}{b}^{2}+....=\frac{xy}{x+y-1}$

Q20. Let a , b , c , d be in GP , then show that (a – b)

^{2}, (b – c)^{2 }, (c – d)^{2}are in GP.Q18. Find the least value of n for which 1 + 3 + 3

^{2}+^{ ....}...... ......._{+ +}3^{n – 1}> 1000 .