send the solution of 4 th question
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Step-by-step explanation:
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Answer: 80
Step-by-step explanation:
Sn=3n^2/2+13n/2
General Formula to find nth term when Sn is given
An= Sn -S(n-1)
A25= S25-S24
First put n=25
S25= 3(25)^2/2 + (13×25) /2
= 1875/2+325/2= 2200/2= 1100
S24= 3(24)^2/2 + (13×24) /2
= (3×576) 2+(13×24) /2
= 1728/2 + 312/2
= 2040/2=1020
So,
A25= S25-S24
= 1100-1020
= 80
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