Question
Prove that for any integer n, n²−n is always even. (NCERT Class 9 – Very Important)
Answer: n²−n = n(n−1). Among two consecutive integers n and n−1, one is even, so their product is even. Hence n²−n is always even.
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Question
Answer: n²−n = n(n−1). Among two consecutive integers n and n−1, one is even, so their product is even. Hence n²−n is always even.
Question
Answer: n²−n = n(n−1). Among two consecutive integers n and n−1, one is even, so their product is even. Hence n²−n is always even.