Please solve Q. No.4

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Please find this answer

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n/2(a+an)=Sn
n/2(8+33)=123
n/2(41)=123
41n=123(2)
41n=246
n=246/41
n=6
a+(n-1)d=an
8+(6-1)d=33
5d=33-8
5d=25
d=25/5
d=5
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