is equal to
n
1/n
1/2 (n+n-1)
1/2 (en + e-n)
The value of 91/3 × 91/9 × 91/27 × ...... is
9
3
1
None of these
If y = 1 + x + x2 + x3 + .... then x is equal to
y-1/y
1-y/y
y/a-y
Fifth term of a GP is 2, then the product of its 9 terms is
256
512
1024
1100
In a geometric progression consisting of positive terms, each term equals the sum of the next two terms. Then the common ratio of this progression equals.
1/2 (1- √5)
1/2 √5
√5
1/2 (√5 -1)
Let a be a positive number such that the arithmetic mean of a and 2 exceeds their geometric mean by 1. Then, the value of a is
5
8
The value of is
log 3
log 2
1/2
If S is the sum of an infinite GP, the first term a, then the common ratio r is given by
The 5th term of the series is
1/3
2/5
If a, b, c be in arithmetic progression, then the value of (a+2 b - c) (2 b + c - a) (a + 2 b + c) is
16 a b c
4 a b c
8 a b c
3 a b c
