If the harmonic mean between the roots of (5 + ) x2 - bx + (8 + 2) = 0 is 4, then the value of b is
2
3
4 -
The relation between pressure p and volume V is given by pV1/4 constant. If the percentage decrease in volume is 1/2, then the percentage increase in pressure is
If the mean and variance of a binomial variate X are 8 and 4 respectively, then P(X < 3) equals to
If are n observations such that , then the least value of n is
18
12
15
16
D.
16
If the coefficients of x9, x10 and x11 in the expansion of (1 + x)n are in arithmetic progression, then n2 - 41n is equal to
399
298
- 398
198