Find the sum of first 32 terms of the arithmetic series if a1=12 and a32=40.
A
830
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B
831
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C
832
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D
834
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Solution
The correct option is B832 Given: First term =12 last term =40
The sum of n terms of arithmetic sequence can be calculated by the formula Sn=n2(a1+an) Where n is the number of terms, a1 is the first term and an is the last term.