find the sum of first 21 terms of the series -11,-7,-3,1,5...
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Answer:
here's the answer. Just apply the formula for sn and get the answer
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Answered by
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The sum of first 21 term is 609
Step-by-step explanation:
Series: -11,-7,-3,1,5...
First term, a = -11
Common difference, d = 4
Sum formula,
Sum
Sum = 609
#BAL
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