find the sum up to n term of series 3×8+6×11+9×14.....nth term
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Explanation:
3×8+6×11+9×14.......
24+66+126......n
here, a=24, d= 66-24=42, an=n
Sn= n/2(a+an)
n/2×(24+n)
24n+n²/2
some thing is wrong in the question
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