Find the value of n if a=3,d=4,sn=1176
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n/2[2×3+(n-1)×4]=1176,
n[6+4n-4]=1176×2,
n[2+4n]=2352,
n(1+2n)=1176,
2n²+n-1176=0,
n[6+4n-4]=1176×2,
n[2+4n]=2352,
n(1+2n)=1176,
2n²+n-1176=0,
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