Q.

The total number of two-digit numbers ‘n’, such that3n+7n is a multiple of 10, is……

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answer is 45.

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Detailed Solution

3n+7n is a multiple of 10, It is possible when  is odd.             Since n is odd, n=11,13,15,.......99            Number of values of n = 45
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The total number of two-digit numbers ‘n’, such that3n+7n is a multiple of 10, is……