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Explain why (n+1)(n+20) is an even number

odd. Explain why (n+1)(n+20) is an even number. even. even. If n is an even number n+1 is n+20 is (n+1)(n+20) is odd x even = If n is an odd number n+1 is n+20 is (n+1)(n+20) is even x odd = n can only be odd or even and BOTH CASES GIVES AN EVEN ANSWER. even. odd. even.

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