Answer:
The probability that a friend who receives 2 greeting cards will receive at least one musical greeting card is 0.3
Step-by-step explanation:
The probability of getting a musical card = P(A) = 30 % or 0.3
Therefore probability of not receiving a plain card = P(A)' = P(B) = 100-30 or 1- 0.3 = 0.7
The probability of receiving at least one musical card when two cards are given is
P(A)×P(A) +P(A)×P(B)-P(B)×P(B) =0.3×0.3+0.3×0.7 = 0.3
The probability of receiving at least one musical card = 0.3
