If a=3 , n=8 , Sn=192 find D.
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Answered by
44
Hope it will help you.
S n = (n/2) [2a + (n - 1) d]
192 = (8/2) [2 (3) + (8 - 1) d]
192 = 4 [6 + 7 d]
192/4 = [6 + 7 d]
48 - 6 = 7 d
42/7 = d
d = 6
S n = (n/2) [2a + (n - 1) d]
192 = (8/2) [2 (3) + (8 - 1) d]
192 = 4 [6 + 7 d]
192/4 = [6 + 7 d]
48 - 6 = 7 d
42/7 = d
d = 6
02611:
Thankyou so much Aryan
Aahaa
Answered by
9
a=3 n=8 and Sn=192
n/2(2a+(n-1)D) = 192
8/2(2×3+(8-1)D)=192
4(6+7D)=192
6+7D=48
7D=42
D=6
n/2(2a+(n-1)D) = 192
8/2(2×3+(8-1)D)=192
4(6+7D)=192
6+7D=48
7D=42
D=6
Tq Tanushree
ur welcm
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