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Permutation: n Different Things Taken All at a Time When All Are Not Different.

Find the secr...

Question

Find the secret number that is larger than half of 100; is greater than 6 tens and smaller than 9 tens; the tens digit is two less than ones digit.

A

97

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B

68

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C

42

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D

57

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Solution

The correct option is B 68
The secret number is greater than 6 tens and smaller than 9 tens
so, the secret number is greater than 60 and smaller than 90
In the given options only 68 lies between 60 and 90
and digit 6 at tens place is two less than digit 8 at ones place.
Hence, 68 is correct answer

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Permutation: n Different Things Taken All at a Time When All Are Not Different.

Standard XII Mathematics

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