Find the 1st term, last term and the sum for the infinite arithmetic series

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asked Mar 13, 2023 31.4k views

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Find the 1st term, last term and the sum for the infinite arithmetic series

Mathematics
college

Nektobit asked

by Nektobit

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1 Answer

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First term:

Last term:

Sum:

$7\cdot3+7\cdot4+7\cdot5+7\cdot6+7\cdot7+7\cdot8+\cdot79+7\cdot10+7\cdot11+7\cdot12+7\cdot13+7\cdot14+7\cdot15$
21+28+35+42+49+56+63+70+77+84+91+98+105

Andrei Sinitson answered Mar 19, 2023

by Andrei Sinitson

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