84=7+(n-1)7/2
84-7=(n-1)7/2
(n-1)=77×2/7
(n-1)=22
n=22+1=23
Written on Feb. 17, 2018, 12:15 p.m.
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How to find n
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84=7+(n-1)7/2
84-7=(n-1)7/2
(n-1)=77×2/7
(n-1)=22
n=22+1=23
Written on Feb. 17, 2018, 12:15 p.m.