Question

if sum of first n terms of an A.P (3n²/2+5n/2)find it's nth term and it's 25th term

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Answer 1

Answer:

answer for the given problem is given

Answer 2

Answer:

sum of first n terms 3n^2/2+5n/2

for n=1,the first term is 3/2+5/2=4

for n=2,the sum of first two term is

6+5=11

so the common difference

11-(4+4)=3

it's n th term is 4+(n-1)3=4+3n-3=3n+1

it's 25 th term is 4+24.3=4+72=76