in an AP a=3,n=8,sn=192...find D
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6
Answer:
The common difference is d=6
given=>S=192
a=3
n=8
d=?
since ,S=n/2[2a+(n-1)d]
192=8/2[2×3+(8-1)d]
192=4[6+7d]
192/4= 6+7d
48=6+7d
48-6=7d
42=7d
42/7=d
6=d
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