Question

Question 1 ❓ Count the number of positive integers greater than 6000 and less than 7000 which are divisible by 5, provided that no digits are repeated.
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Answer 1

Clearly, thousands digit is 6.

Number of numbers with units digit 0=(1×8×7×1)=56

Number of numbers with units digit 5=(1×8×7×1)=56

Required number of numbers=(56+56)=112.

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