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2.(4 marks) If P(A) > 0,P(B) > 0 and P(A) < P(A|B), show that P(B) <...

2. If P(A) > 0,P(B) > 0 and P(A) < P(A|B), show that P(B) < P(B|A).
3. Find the number of integers greater than 400 that can be formed with the  digits 3, 5, 7 and 9 where no digits are repeated.

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