The value of 91/3 × 91/9 × 91/27 × ...... is
9
3
1
None of these
The arithmetic means of first n odd natural number is
n2
2 n
n
3 n
If 2/3, k, 5/8 are in AP, then value of k is
15
21
12
31/48
If twice the 11th terms of an AP is equal to 7 times its 21st term, then its 25th term is equal to.
24
120
0
The 5th term of the series is
1/3
2/5
If three numbers a,b,c are in harmonic progression, then which of the following is true?
1/a, b, 1/c are in AP
1/bc, 1/ca, 1/ab are in HP
ab, bc, ca are in HP
a/b, b/c, c/a are in HP
In an arithmetic progression, the 24th term is 100. Then, the sum of the first 47 terms of the arithmetic progression is
2300
2350
2400
4700
The sum of the integers from 1 to 100 which are divisible by 3 and 5 is
2317
2632
315
2489
The coefficient of xn in the expansion of loga (1+x) is
The sum to infinity of the progression 9 - 3 + 1 -1/3 + .... is
9/2
27/4
15/2
