A 9-digit number in which zero does not ...

A 9-digit number in which zero does not appear and no digits are repeated has the following properties: The number comprising the left most two digits is divisible by 2, that comprising the left most three digits is divisible by 3, and so on. The number is (a) 183654729 (b) 381654729 (c) 983654721 (d) 981654723

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