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The first four terms of an arithmetic sequence are 7, 14, 21, 28... Calculate the sum of the first 50 terms.

The first four terms of an arithmetic sequence are 7, 14, 21, 28... Calculate the sum of the first 50 terms.
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23 votes
The first four terms of an arithmetic sequence are 7, 14, 21, 28... Calculate the sum of the first 50 terms.

asked
User Sahil Grover
by
7.0k points

1 Answer

5 votes

Explanation:

a = 7

d = 14-7 = 7

s(50) = n/2*[a+(n-1)*d]

= 50/2*[7+(50-1)*7]

= 8750

answered
User Reversed Engineer
by
8.4k points
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