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Quantitative Aptitude

Quadratic Equations

Q. The unit's...

Question

Q. The unit’s digit in $697^{543}$

A

6

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B

3

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C

7

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D

5

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E

None of these

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Solution

The correct option is B 3
7 $^{4}$ has 1 in its unit’s place
543 divided by 7 has 4 as reminder
= $7^{4^{135}} \times 7^{3}$ = given 3 in the units place.

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