3 years ago

the first term of an arithmetic sequence is 3000 and the tenth term is 1200. the sum of the first 20 terms of the sequence

Mathematics

1 answer:

Kruka [31]3 years ago

8 0

Step-by-step explanation:

1100

To find the sum of the first n terms of an arithmetic series use the formula,

n(a

)

20(10+100)

2200

=1100

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