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Shreyans Singh

Subject: Maths, asked on 23/9/17

Q. If 4th, 7th, 10th terms of a G.P. are p,q,r respectively then
(A) $p^{2} = q^{2} + r^{2}$ (B) $q^{2} = p r$ (C) $p^{2} = q r$ (D) $p q r + p q + 1 = 0$

Ranjan Shivam

Subject: Maths, asked on 22/9/17

solve it
Q. Find
(i) $\sum_{r = 0}^{9} \frac{r^{2}}{r^{2} + {(9 - r)}^{2}}$

Shubhrajyoti Ghosh

Subject: Maths, asked on 21/9/17

Dear expert, why the above sum is done so elaborately?? Why is it not done in short as follows:

a=1, l=11

Therefore, S_n=n/2(a+l)

or, 36=n/2(1+11)

or, 36=(n/2)*12

or, 36=6n

or, n=6

Royel Ghost

Subject: Maths, asked on 19/9/17

EXAMPLE 16. Show that there is no A.P. which consists of only distinct prime numbers.
EXAMPLE 17. Show that in an A.P. the sum of the terms equidistant from the beginning and end is always same and equal to the sum of first and last terms.

Siddharth Bothra

Subject: Maths, asked on 17/9/17

Q). If the $6^{t h} a n d 16^{t h}$ term of a G.P. are x - y and $x^{2} + x y + y^{2}$ respectively, then what is the $11^{t h}$ term of this G.P?

Siddharth Bothra

Subject: Maths, asked on 17/9/17

Plz give the answer

Yashaswi Agrawal

Subject: Maths, asked on 16/9/17

1 + (2 + 3) + (4 + 5 + 6)... up to n terms. Find the sum of the nth bracket.

Shivam Desale

Subject: Maths, asked on 15/9/17

Qn. No. 29:

29. If the m^th term ofa H.P be n and n^thterm be m, then the r^th term will be.

$(A) \frac{r}{m n} (B) \frac{m n}{r + 1} (C) \frac{m n}{r} (D) \frac{m n}{r - 1}$

Shubhrajyoti Ghosh

Subject: Maths, asked on 13/9/17

The n^th term of a sequence is equal to half of the sum of its first (n – 1) terms. If T₁ = 10, then what is the value of T₉?
(A) $\frac{10.935}{16}$ (B) $\frac{10.935}{32}$ (C) $\frac{10.935}{64}$ (D) $\frac{10.935}{128}$

Soumyadeep Kar

Subject: Maths, asked on 12/9/17

45th question

Soumyadeep Kar

Subject: Maths, asked on 10/9/17

38th question
Q.38. If $S = \sum_{n = 1}^{99} \frac{5^{100}}{{(25)}^{n} + 5^{100}}$
(A) S = 49.5
(B) S = 50
(C) S = 49
(D) S = 50.5

Ashutosh Kumar

Subject: Maths, asked on 4/9/17

Please solve Q.no.25 of ex-9.3 by any other method.The ncert solution given by meritnation of this question is too lengthy and sometimes confusing thats why please solve this question by any other short method.

Amitesh Kumar

Subject: Maths, asked on 1/9/17

5 distinct 2 digit no. are in G.P find the middle term?

Soumyadeep Kar

Subject: Maths, asked on 29/8/17

5. If $\frac{1}{1^{4}} + \frac{1}{2^{4}} + \frac{1}{3^{4}} + . . . + \infty = \frac{π^{4}}{90}$ , then the value of $\frac{1}{1^{4}} + \frac{1}{3^{4}} + \frac{1}{5^{4}} + . . . + \infty$ is

Arunav Goel

Subject: Maths, asked on 23/8/17

If n^th term of the series 25+29+33+.... and 3+4+6+9+.... are equal, then find n.

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