The number of 3-digit numbers, formed using the digits 2,3,4,5 and 7 , when the repetition of digits is not allowed, and which are not divisible by 3 , is equal to__________

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total number of three digit numbers not divisible by 3 will be formed by using the digits aligned & (4,5,7) & (3,4,7) & (2,5,7) & (2,4,7) & (2,4,5) & (2,3,5) & number of ways =6 × 3 !=36 aligned

The number of 3-digit numbers, formed using the digits 2,3,4,5 and...

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