When two coins are tossed, total outcomes are

{HH, HT, TH, TT} =4

A=Tail appears on one coin= {HT, TH} =2

Probability of A = P(A) =

B= One coin shows head ={HT, TH} =2

Probability of B =P(B) =

(A ∩ B) = one coin shows head and another shows tail = {HT, TH} =2

P (A ∩ B) =

Hence, =

= (answer)