SOLUTION: Solve: 1+6+11+......+x=148

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Question 976404: Solve: 1+6+11+......+x=148
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
%28n%2F2%29%281%2B%281%2B5%28n-1%29%29%29=148 which here will give you the last term's index.

x=1%2B5%28n-1%29