Grade 10IIT JEE Entrance Exam
in an a.p. the sum of `n` terms is 5n square-5n find tenth term
1 Answer
Jitendra Kumar
Let $S1$ be the sum of the given AP $\rightarrow S1= 5n2-5n$
First terms is $a1=S1 = 0$ and $S2=a1+a2 =10=> a2 = 10$
So common difference $d = 10$
Thus general term is $an = a1+(n-1)d=10(n-1)$
Hence tenth term is $a10=10(10-1)=90$
First terms is $a1=S1 = 0$ and $S2=a1+a2 =10=> a2 = 10$
So common difference $d = 10$
Thus general term is $an = a1+(n-1)d=10(n-1)$
Hence tenth term is $a10=10(10-1)=90$
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