Question

Find the unit digit of (7493263)x(15129) + 634ˆ262 + 634ˆ263
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Answer 1

Answer:

As 9×3 =27 i.e unit digit is 7

7493263×15129=________7

it's unit digit is 7

NOW,

4 HAS A CYCLICITY OF 2 :-

it gives 4 as unit digit at odd power

and 6 as unit digit at even power.

So,

634^262=_______6

it's unit digit is 6

634^263=_______4

it's unit digit is 4

therefore result unit digit = 7+6+4=7

7 IS ANS

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