Pls solve 10 and 11 with steps.
I need with steps only no direct answer.
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a= a
l=l
S=s
We know that
S= n/2 (a+l)
n/2=S/a+l
n=2s/a+l
Also
S=n/2(2a+(n-1)×d)
Sustituting value of n
2S=2s/a+l ×(2a+2s/a+l-1)×d
a+l=2a+(2s-a-l/a+)l×d
a+l-2a=(2s-a-l/a+l)×d
D=-(a+l)^2/2s-a-l
It can also be written as
D= a^2+l^2/2s-(a+l)
Option d is right
l=l
S=s
We know that
S= n/2 (a+l)
n/2=S/a+l
n=2s/a+l
Also
S=n/2(2a+(n-1)×d)
Sustituting value of n
2S=2s/a+l ×(2a+2s/a+l-1)×d
a+l=2a+(2s-a-l/a+)l×d
a+l-2a=(2s-a-l/a+l)×d
D=-(a+l)^2/2s-a-l
It can also be written as
D= a^2+l^2/2s-(a+l)
Option d is right
Well your method is absolutely right but there is some mistake in the middle.
I got the answer by following your method
I think if you solve this question on the paper you will get the answer
By the way the answer is A
I got the answer by following your method
I think if you solve this question on the paper you will get the answer
By the way the answer is A
Ook sry for the mistake
Its ok
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