Q.

The number of positive integers less than 1,00,000 which contain exactly one 2, one 5 and one 7 in decimal representation is

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a

2940

b

7350

c

2157

d

1582

answer is A.

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Detailed Solution

5c1×4c1×3c1×7×7=60×49=2940.
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The number of positive integers less than 1,00,000 which contain exactly one 2, one 5 and one 7 in decimal representation is