If in an A.P., first term is 20 and 12th term is 120. Find the sum up to 12th term.

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answerhappygod
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If in an A.P., first term is 20 and 12th term is 120. Find the sum up to 12th term.

Post by answerhappygod »

a) 420
b) 840
c) 140
d) 1680
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