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Number Properties (Language)

Q. If we writ...

Question

Q. If we write all the whole numbers from 200 to 400, then how many of these contain the digit 7 once and only once?

A

32

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B

34

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C

35

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D

36

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Solution

The correct option is D 36
Number of numbers that contain 7 in units place only once = 18
Number of numbers that contain 7 in ten’s place only once = 18
Total sum of digits containing 7 only once = 18 + 18 = 36

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Number Properties (Language)

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