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Number of natural numbers less than 1000...

Number of natural numbers less than 1000 and divisible by 5 can be formed with the ten digits, each digit not occuring more than once in each number is

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at ones place there can only 2 numbers=5,0 which are divisible by 5.
at hundred place there can be 9 numbers.
at tens place there can be 8 numbers because number can not be repeated.
total possible values=9*8*2=144.
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