A number leaves remainder 1 or 3 when divided by 4. What will be the remainder when its square is divided by 4?
Answer and explanation
Correct answer: 1
Step 1: The possible remainders are 1 and 3. Step 2: (1^2=1) and (3^2=9=4\times2+1), so the remainder is 1 in both cases. Step 3: The square of an odd number leaves remainder 1 when divided by 4.
Frequently asked questions
What is the correct answer to this question?
1
Why is this the correct answer?
Step 1: The possible remainders are 1 and 3. Step 2: (1^2=1) and (3^2=9=4\times2+1), so the remainder is 1 in both cases. Step 3: The square of an odd number leaves remainder 1 when divided by 4.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Euclid’s Division Lemma.
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