Easy trick

Number Theory Level pending

999999999999 9 99999999999 9999999999999 ^{99999999999} what is the last digit?

7 8 9 1

Ritam Podder by Ritam Podder , 21, India

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2 solutions

Ritam Podder
Sep 6, 2015

If the power of 9 is a odd number then the last digit is 9 and when the power of 9 is a even number then the last digit is 1.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

easily solvable by using mod 10

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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