Question

please answer it fast

Answer 1

1.
19c1/20c1 +19c1
19/39
2.
20c1/ 20c1 +19c1
20/39

Answer 2

n(S)=20boys+19 girls=39 EventA:Selecting a boy Total boys=20 n(A)=20 P(A)=n(A)/n(S)=20/39  EventB:Selecting a girl  Total girls=19 n(B)=19 p(B)=n(B)/n(S)=19/39  Hope it helps.....