find the sum of 11 terms of the AP: 2,5,8
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Answer:
S11 = 187
Step-by-step explanation:
a=2
d=3
n=11
Sn = n/2{2a+(n-1)d}
S11 = 11/2{2(2)+(11-1)3}
= 11/2(4+30)
= 11/2×34
= 11×17
= 187
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