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Q.

The power of $' 9'$ of any index. The repetition of units digit is

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a

5

b

0

c

1

d

9

answer is C.

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Detailed Solution

Let

9^{n}

be the power of

' 9'

of any index.

$9^{1} = 9$

$9^{2} = 81$

$9^{3} = 729$

It’s bicycle in units digit.

$∴$ last digits are $9, 1$ .

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