Question

You are walking along a street. If you just choose a stranger crossing you, what is the probability that his next birthday will fall on a Sunday?

Answer 1

Days in a week (S) = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday}

n(S) = 7

∴ No. of days in week = 7

Event of selecting Sunday (A) = {Sunday}

n(A) = 1

∴ Probability of selecting Sunday = `("n"("A"))/("n"("S")) = 1/7`