Find the probability that a number selected at random from 40 to 50 is a prime

Simplify 0.0324×0.000640.48×0.012

If P = 18, Q = 21, R = -6 and S = -4, Calculate (P−Q)3+S2R3 ( P − Q ) 3 + S 2 R 3 + S2

Find the smallest number by which 252 can be multiplied to obtain a perfect square

Divide the L.C.M of 48, 64, and 80 by their H.C.F

Find the reciprocal of 2312+13

Evaluate (212)3 - (121)3 + (222)3

If Musa scored 75 in biology instead of 57, his average mark in four subjects would have been 60. What was his total mark?

Two chords QR and NP of a circle intersect inside the circle at x. If RQP = 37o, RQN = 49o and QPN = 35o, find PRQ