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Combination with Restrictions

How many numb...

Question

How many numbers between 400 and 600 begin with or end with a digit of a 5?

A

40

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B

100

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C

110

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D

120

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Solution

The correct option is C 110
Numbers satisfying the given conditions are 405, 415, 425, 435, 445, 455, 465, 475, 485, 495 and 500 to 599.
Hence total numbers= $10 + 100 = 110$

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