Answer:
1/6
Explanation:
Color of Shirt Number
Red 1
Blue 6
Green 1
Pink 4
Total shirts=1+6+1+4=12
P(Dennis picks a pink shirt)=no. of pink shirts/total no. of shirts
=4/12
=1/3
P(coin lands tail)=1/2
P(Dennis picks pink shirt and coin turns up tail)=

=1/6
(since, the events were independent P(A∩B)=P(A)×P(B))