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12. Write three 5-digit numbers that are divisible by 2, 5 and 10.
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Divisible by 2
The largest 5-digit number is 99999. To be divisible by 2, the last digit should either be divisible by 2 or be 0. The last digit in the above number is 9.
Divisible by 5
Number of 5 digit numbers which are divisible by 5 and each number containing the digit 5, digitsbeing all different is equal to k(4!), the value of k is.
Divisible by 10
The greatest 5-digits number divided by 720 is 99360 (it is easy to check). It means that x-10 = 99360
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