10th term of an A.P is 52, 16th term is 82 then tn will be
n + 2
5n - 2
5n + 2
5n
Sum of the sequence 9, 99, 999, 9999 up to n terms is
(10n -1) - n
9/10 (10n - 1) - n
10/9 (10n - 1) - n
None of these
Which terms of the G.P 2, 2√2, 4,........ is 128?
12
14
13
15
Given an = (n+1)2/n then a7 is
64
67
49/8
64/7
The number of terms in the A.P 7, 13, 19.......97 is
97
17
16
The sum to the first 25 terms of the series 1 + 2 + 3......... is
305
325
315
335
How many terms of the G.P 3, 3/2, 3/4......... are needed to give the sum 3069/512?
10
11
9
8
If the nth term of an AP is 6n - 1. Then its (n + 1)th term is
6n + 4
6n + 5
6n - 4
6n - 5
The number of terms of A.P 3, 7, 11, 15. . . where the sum is 406 is
5
If -2/7, x, -7/2 are in G.P, then x =
1
-1
± 1