a=17 l=350 d=9 find n and sn
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heya here is your answer
__$$$$
tn=a+(n-1)d
350=17+(n-1)9
9n=350-17+9
9n=342
n=38
for sn
sn=n(a+L)/2
sn=38(17+350)/2
sn=6973
hope it helps
__$$$$
tn=a+(n-1)d
350=17+(n-1)9
9n=350-17+9
9n=342
n=38
for sn
sn=n(a+L)/2
sn=38(17+350)/2
sn=6973
hope it helps
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