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__________

Step-by-step solution

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