`S= {1,2,3,.... 20}` if 3 numbers are chosen at random from `S,` the probability for they are in A.P. is (A) `3/38` (B) `35/33` (C) `33/35` (D)`1/38`

S={1,2,3,....11} if 3 numbers are chosen at random from S, the probability for they are in G.P.

If S={1,2,3,...,20} .If 3 numbers are chosen at random from S .The probability for they are in A.P is I then 38I-1 is

If S={1,2,3,...,20} .If 3 numbers are chosen at random from S. The probability for they are in A.P is I then 38I-1 is

Three numbers are chosen at random from 1 to 20 .The probability that they are consecutive is

A number x is chosen at random from the numbers -3,-2,-1,0,1,2,3 the probability that |x|<2 is

A positive integer is chosen at random the probability that the sum of the digits of its square is 39 is (A) 1/33 (B) 2/33 (C) 1/11 (D) Zero

From the set {1,2,3,4,5} two numbers a and b (a != b) are chosen at random . The probability that a/b is an integar is

In a room,there are 6 couples.Out of them if 4 are chosen at random the probability that they may be 2 couples is (A) (2)/(33) (B) (1)/(33) (C) (1)/(66) (D) (32)/(33)