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

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

Find the 1st term, last term and the sum for the infinite arithmetic series-example-1
User Nektobit
by
8.4k points

1 Answer

1 vote

First term:


7(3)=21

Last term:


7(15)=105

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
819

User Andrei Sinitson
by
8.4k points
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