Sum of the sequence 9, 99, 999, 9999 up to n terms is
(10^{n} -1) - n
9/10 (10^{n} - 1) - n
10/9 (10^{n} - 1) - n
None of these
The value of 11^{2} + 12^{2} + .....20^{2} is
3845
2485
2470
3255
1 + 2 + 3 +........30 =
465
930
900
500
If the n^{th} term of an AP is 6n - 1. Then its (n + 1)^{th} term is
6n + 4
6n + 5
6n - 4
6n - 5
If G is geometric mean of numbers a and b then G =
√ab
±√ab
ab
a/b
10^{th} term of an A.P is 52, 16^{th} term is 82 then t_{n }will be_{ }
n + 2
5n - 2
5n + 2
5n
If -2/7, x, -7/2 are in G.P, then x =
1
-1
± 1
The number of terms in the A.P 7, 13, 19.......97 is
97
17
16
15
Which term of the G.P, 2, 8, 32.......... up to n term is 131072?
8^{th} term
9^{th} term
7^{th} term
6^{th}term
If the sum of n terms of an A.P is (Pn + qn^{2}) where p and q are constants. Then the common difference is
2 + q
2q
2/q
2 - q