Number of four-digit numbers of the form, N=abcd which satisfy following three conditions (i) 4000≤N<6000(ii) N is a multiple of 5(iii) 3≤b

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answer is 24.

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Detailed Solution

We have N=abcdFirst place a can be filled in 2 ways, i.e. 4, 5 (4000 < N < 6000)For b and c, total possibilities are 6(3≤b

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