A) 80
B) 120
C) 60
D) 78
Correct Answer: A
Solution :
We have given that \[{{S}_{n}}=\frac{3{{n}^{2}}}{2}+\frac{13n}{2}\] 25th term = Sum of 25 terms - Sum of 24 terms \[={{S}_{25}}-{{S}_{24}}\] Now, \[{{S}_{25}}=1100\] and \[{{S}_{24}}=1020\] \[\therefore \] 25th term\[=1100-1020=80\]You need to login to perform this action.
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