Question

7th term of an arithmetic sequence is 32.

How to find sum of first term and 13th term?

find sum of first 13 terms?
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Answer 1

7th term is the median of the arithmetic sequence. i.e.

=sum of all 13 numbers / 2

= 7th term

=32

so,

32

=sum of 13 no:s / 2

i.e. Sum of 13 no:s is

=32×2

=64

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