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So you have to have a idea of permutations there are 10 digits from 0 to 9 so 0 cant be is first place so the 1st place can be arranged 10 -1 ways and the other three places in 10 ×10 ×10 ways
 the answer is  9× 10 ×10 ×10 = 9000 ways is the answer
0 0 0
any question please ask and plz mark as best
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