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Was it really easier to post a question on here that it would be to use a calculator?

Using basic algebra:

(N/2)(A1+An)=Sn

(15/2)(1+15)=120

Or in even more basic algebra:

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15=120

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16y ago

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