shell47 shell47

02-06-2017
Mathematics

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B= {5,7,9,11,14} what is n(B).

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mreijepatmat mreijepatmat

15-06-2017

This is an arithmetic progression with d=2 as common difference:
(7-5 =2; 9-7 =2; 11-9 =2, etc.) and with 1st term a₁ =5

a₈ = a₁ + (n-1)d (where n is the number/rank of terms
a₈ = 5 + 7x2

a₈ = 19

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