Q.

The last digit, that is, the digit in the units  place of the number (67)25-1 is

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answer is 6.

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Detailed Solution

On dividing 25 by 4 the remainder =1  Therefore, unit digit in (67)25=71=7 Therefore, unit digit in (67)25-1=7-1=6 .
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The last digit, that is, the digit in the units  place of the number (67)25-1 is