an=4 d=2 Sn=14 n=? a=?
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Answer:
an=a+(n-1)d
4= a+(n-1)2
4=a+2n-2
4+2=a+2n
6=a+2n
a=6-2n
sn=n/2 [2a+(n-1)d]
14=6-2n/2 [2×6-2n+n-1]4
14=6-2n /2 [12-4n+n-1]
28=6-2n (44-12n)
28=264-72n-88n+24n^2
24n^2-160n-136 .
isko solve krr lo answer aa jayega I think
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