Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is ?	Options:  A) 17/22  B) 17/29  C) 17/98  D) 17/20  E) 17/27
n(S) = 20   n(Even no) = 10 = n(E)   n(Prime no) = 8 = n(P)   P(EᴜP)   = 10/20 + 8/20 - 1/20   = 17/20   Answer:17/20
<result>D</result>
Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is ?