self Maths Puzzle

In a certain quiz competition a candidate can win, if he answers all the 5 questions. If a candidate appears for the quiz and he is sure about the answers of first two answers, but 50% sure about third,75% sure about fourth and 25% sure about the fifth question's answers of the quiz.Then what is the probability that candidate appeared for quiz will win?

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self Other Question

find the remainder when 3^164 divided by 162 if u have given a cake and u r supposed to cut it not more than 3 times.it must be off in 8 pieces after 3rd cit.how???