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If a number leaves remainder 1, 3, 7, or 9 when divided by 10, what possible remainders can its square have when divided by 10?

Answer and explanation

Correct answer: Only 1 and 9

Step 1: Check the squares of the given remainders. Step 2: (1^2) and (9^2) leave remainder 1, while (3^2) and (7^2) leave remainder 9. Step 3: When listing possible remainders, count repeated results only once.

Related tags

Euclids-Division-LemmaSquare-RemaindersNumber-FormsEuclid’s Division LemmaEuclid S Division LemmaReal NumbersMathematicsClass 10 Mcq

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