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Question

In an arithmetic series, a1=−14 and a5=50. Find the sum of the first 5 terms.

A
60
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B
70
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C
80
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D
90
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Solution

The correct option is A 90
First term = a = -14
last term, l = 50
an=50
n = 5
Sn=n2[a+l]
S5=52[14+50]
S5=2.5[36]
S5=90

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