If n is an odd integer, which of the following must be an odd integer? (A) n - 1 (B) n + 1 (C) 2n (D) 3n + 1 (E) 4n + 1

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4n+1
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Maths Teacher

The first 4 options certainly give an odd number as answer. Hence the only correct answer is 4n+1 (E)
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(E) 4n + 1
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E) 4n+1
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