Recent questions tagged progression and series

+3 votes

1 answer

Find the sum of the series 1.2 + 2.2^2 + 3.2^3 + … + 100. 2^100.

asked Feb 28, 2019 in Class 12 by kratos

+1 vote

1 answer

The n^th term of the sequence 5 + 55 + 555 + . . . . . . is (A) 5 × 10^n–1

asked Feb 15, 2019 in Class 11 by kratos

+2 votes

1 answer

The sum of the series (1/1 x 5 +1/5 x 9 + 1/9 x 13 ...+ 1/221 x 225) is

asked Feb 9, 2019 in Class 12 by kratos

+1 vote

1 answer

If pth, q^th and r^th term of a A.P. are three consecutive terms of G.P. find common ratio of the G.P.

asked Jan 26, 2019 in Class 11 by kratos

+2 votes

1 answer

If x/(b-c) = y/(c-a) = z/(a-b), Prove that: ax+by+cz = 0

asked Jan 11, 2019 in Class 11 by kratos

+1 vote

1 answer

If (m+1)th term of an A.P is twice the (n+1)^th term, Prove that (3m+1)^th term is twice the (m+n+1)^th term.

asked Dec 29, 2018 in Class 11 by kratos

+3 votes

1 answer

If two arithmetic means A1 , A2 , two geometric means G1 , G2 and two harmonic means H1 , H2 are inserted between two numbers p and q then _____

asked Dec 21, 2018 in Class 11 by kratos

+2 votes

1 answer

The n^th term of the A. P. 3, 8, 13, 18, ............ is 148. Find n

asked Dec 16, 2018 in Class 11 by kratos

+3 votes

1 answer

If the first term of an A.P. is a and its common difference is d then n^th term = a + (........) x d.

asked Nov 8, 2018 in Class 11 by kratos

+2 votes

1 answer

If the pth, qth and rth terms of a G.P. are a, b and c, respectively. Prove that a^(q – r) b^(r – p) c^(P – q) = 1.

asked Oct 17, 2018 in Class 11 by kratos

+1 vote

1 answer

If log a, log b, log c are in A.P., then a, b, c are in

asked Oct 8, 2018 in Class 12 by kratos

+3 votes

1 answer

Two A.M.’* A1 and A2, two G.M.’* G1 and G2 and two H.M’* H1 and H2 are inserted between any two number,

asked Oct 1, 2018 in JEE by kratos

+1 vote

1 answer

Find the sum of n ≠0 terms of the series whose n^th term is tn = n^2 +3n.

asked Aug 31, 2018 in Class 11 by kratos

+1 vote

1 answer

The product of n geometric means between x and 1/x , where x > 0, is :

asked Aug 23, 2018 in JEE by kratos

+3 votes

1 answer

If * = [1+(-1/3)][1+(-1/3)^2][1+(-1/3)^4][1+(-1/3)^8.....] then * =

asked Aug 1, 2018 in Class 12 by kratos

+3 votes

1 answer

Find the sum of the series 5, 55, 555, 5555, ... to n terms.

asked Jul 17, 2018 in JEE by kratos

+3 votes

1 answer

n arithmetic means are inserted between two sets of numbers a, a^2 & b, b^2 where a, b ∈R.

asked Jul 10, 2018 in JEE by kratos

+3 votes

1 answer

Find the greatest value of xyz for positive value of x, y, z subject to the condition xy + yz + zx = 12.

asked Jul 9, 2018 in JEE by kratos

+1 vote

1 answer

Which term of the sequence 72, 70, 68, 66, ..... is 40 ?

asked Jun 21, 2018 in Class 11 by kratos

+2 votes

1 answer

A= a + A1 + A2 + …..+ AN + b B = a + G1+ G2+ ….+ GN + b

asked Jun 9, 2018 in JEE by kratos

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