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? Choose one:
A) 7/20
B) 1/2
C) 16/19
D) 3/5
E) 4/5
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   7/20)
<result>A</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?