Out of first 28 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -. Pick one.
A) 1/2 B) 16/19 C) 4/5 D) 22/28 E) 3/5
n(S) = 28   n(Even no) = 14 = n(E)   n(Prime no) = 9 = n(P)   P(EᴜP) = 14/28 + 9/28 - 1/28 = 22/28   ANSWER:22/28
<result>D</result>
Out of first 28 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.