Exactly one is correct

Number Theory Level 2

Which one is correct?

A. 4 4 2 + 7 7 2 = 4477 44^2+77^2=4477

B. 5 5 2 + 6 6 2 = 5566 55^2+66^2=5566

C. 6 6 2 + 5 5 2 = 6655 66^2+55^2=6655

D. 8 8 2 + 3 3 2 = 8833 88^2+33^2=8833

E. 9 9 2 + 2 2 2 = 9922 99^2+22^2=9922

A C E D B

Hana Wehbi by Hana Wehbi , 51, USA

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1 solution

J C
May 9, 2017

Use the last digit of each perfect square, add the two together, and see if it matches the last digit of the answer. Only choice is D.

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Interesting. Thank you for posting a solution.

Hana Wehbi - 4 years, 1 month ago

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