self Maths Puzzle

find the number of 5 digits numbers can be formed using the digits 1,2,3,4,5 if no digit is reapeted and two adjoint digits are not together

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self Other Question

there are 8 equilant balls.but 1 of them is different(more) weight than other.how can u find the differ ball by weighing two balances only..? Among the following series.. Find out the wrong number in the series:
125,106,88,76,65,58,53