Question

if the sum of the n terms of an AP is 4n-n×n, then what is the first term? what is the sum of first terms? what is the second terms ?

Answer 1

Sum of n terms=4n-n^2
sum of first term = first term(a¹)
s¹=a¹=4(1)-(1)^2
a¹=4-1=3

s²=4(2)-(2)^2
s²=8-4=4
now 2nd term (a²)=s²-s¹=4-3=1

here s²=sum of two terms
a¹=first term
a²=2nd term


hope you get it....if yes

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Answer 2

Answer:

Just Think The Given Equation Of The Sum Of " n " Terms Is correct for all the terms in the AP , So If you put n=1 You get Sum of 1 terms which is actually the value of first term a1 . so The First Term Is 3.