Question

How many 3-digit numbers have exactly two 7s?

Answer 1

Answer:

there are many numbers which will have exactly two 7s, like 177, 277, 377, 477, 577, 677, 877, 977

Step-by-step explanation:

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Answer 2

Answer:

23 numbers have exactly two 7s.

Step-by-step explanation:

in first case Hundredth place cannot be 0, hence only 7 possibility.

Refer attachment for answer.