The ten's digit of 9^20 is 0, what is the tens' digit of ...

Free Practice Question

PS · Problem Solving

705-805

Divisibility/Multiples/Factors

The ten's digit of

9^{20}

is 0, what is the tens' digit of

9^{19}

?

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A

5

B

6

C

7

D

8

E

9

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