in a group of 20 boys and 10 girls, 5 boys and 3 girls are honest. if two persons are to be selected at random from the group, find the probability if either both are girls or both are honest.

favourable outcome are   no of girls + no of honest boys    = 10+5=15
total favourable outcomes are 30
p(a) = 15/30 = 1/2
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