If (u=10q+7), what is the remainder when (u^2-u) is divided by 10?
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Answer and explanation
Correct answer: 2
Step 1: The remainder of (u) is 7. Step 2: The remainder of (u^2-u) comes from (7^2-7=42), and (42=10\times4+2). Step 3: Substitute the remainder first, then find the final remainder.
Frequently asked questions
What is the correct answer to this question?
2
Why is this the correct answer?
Step 1: The remainder of (u) is 7. Step 2: The remainder of (u^2-u) comes from (7^2-7=42), and (42=10\times4+2). Step 3: Substitute the remainder first, then find the final remainder.
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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