The sum of n terms of an ap is sn =2nsquare +6n find the first term and the common difference
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Answer:
sn=2n²+6n
S1=2(1)²+6(1)=8=a=first term
S2=2(2)²+6(2)=8+12=20=a+a2
=>a2=20-a=20-8=12
d=a2-a=12-8=4
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