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5 May, 18:10

Which expression describes the nth term of the sequence of odd numbers that are greater than or equal to 3

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  1. 5 May, 18:24
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    The odd numbers can be given by:

    2n - 1 Assuming n is starting at 1.

    3 is the second odd number

    2 (2) - 1 = 4 - 1 = 3

    If we wish to start at at 3 then we only need to add 1 to the n:

    2 (n+1) - 1 = 2n + 1.

    And hence our expression.
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