exam Maths Puzzle Numerical Ability

4 over radical 5 plus radical2

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exam Other Question

Events W,X,Y and Z are independent, and P(W)= 0.75, P(X)= 0.25, P(Y)= 0.2, and P(Z)= 0.3. Find P(W and X). how many different 4-digit numerals are there? (hint: zero cannot be used as the first digit)