if a=3,n=8 and Sn=192, find d.
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ramsir47:
your formula is wrong
sn = n/2 { 2a + ( n - 1 ) × d } is correct
sorry....for the mistake
and now see the answer
hope you like the answer now......and sorry for the mistake
Answered by
13
Given:
a=3.
So the first term is 3.
n=8
number of terms is 3.
Given Sn=192.
We know that:
Sn=n/2*[2a+(n-1)d]
==)192=n/2*[2a+(n-1)d]
==)384=8*[6+7*d]
==)6+7d=384/8
==)7d=48-6
==)7d=42
==)d=42/7
==)d=6
The value of d is 6.
Hope it helps:-)
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