Exam Maths Puzzle Numerical Ability

Two identical circles intersect so that their centers and the points at which they intersect from a square of side 1 cm. The area in sq.cm of the portion that is common to the two circles is:

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Exam Other Question

there are 5 letters and 5 envelopes . what is the probability of each lettler put in correct envelope. 3+5+6=151872
5+5+6=253094
5+6+7=303585
5+5+3=251573
9+4+7=??????