Book Maths Puzzle

How many three digit numbers divisible by 5 can be formed using any of the digits from 0 to 9 such that none of the digits can be repeated?

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Book Other Question

How many numbers, between 100 and 1000, can be formed with the digits 3, 4, 5, 0, 6, 7? (Repetition of digits is not allowed) Arun wants to send invitation letter to his 7 friends. In how many ways can he send the invitation letter if he has 4 servants to carry the invitation letters