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If m and n are positive integers, then the digit in the units' place of 5n + 6m is always (a) 1 (b) 5 (c) 6 (d) n + m |
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Answer» (a) 1 The units' digit of any positive integer power of 5 is always 5 and that of any positive integral power of 6 is always 6. \(\therefore\) Units’ digit of 5m + 6n = Units' digit of (5 + 6) = Units' digit of 11 = 1. |
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