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How many four-digit numbers N = abcd satisfy all of the following conditions?

1. 4000 <= N < 6000

2. N is a multiple of 5.

 Jan 19, 2021
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So we have the multiples of 5 from 4000-5995.

Dividing each multiple of 5 by 5 we get 800-1199.

1199-800+1=400 multiples

 Jan 19, 2021

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