For the following exercises, use the formula for the sum of the first n terms of an
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For the following exercises, use the formula for the sum of the first n terms of an arithmetic series to find the sum.
−1 + 3 + 7 + ... + 31
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#CBSE class 10th - 10 CGPA , 100/100 in MATHEMATICS.
#CBSE class 12th - 10 CGPA , 99/100 in MATHEMATICS.
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