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Predicting Last Digit of an Exponent

Find unit's d...

Question

Find unit's digit in $y = 7^{17}$ + $7^{34}$

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Solution

$7^{17} + 7^{34} = 7^{1} + 7^{2} = 56$
Hence, the unit digit is $6$ .

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Predicting Last Digit of an Exponent

Standard VII Mathematics

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