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8 September, 09:08

What is the 87th odd positive number?

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  1. 8 September, 09:33
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    This an Arithmetic Progression question: (odd number: 1,3,5,7, ...)

    1st term a₁ = 1

    the common difference is d=2

    a term of rank n in a AP = a₁ + (n-1) d, where n = rank of the term.

    Now let's apply the formula

    a₈₇ = a₁ + (87-1).2

    a₈₇ = 173
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