JoeKings
JoeKings
14-06-2017
Mathematics
contestada
What is the 87th odd positive number?
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mreijepatmat
mreijepatmat
14-06-2017
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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