Question

Given l=28, s=144, and there are total 9 term find a

Answer 1

S=144 l=28 n=9
Sn=n/2(a+l)
9/2(a+28)=144
a+28=32
a=4

Answer 2

HLO MATE HERE IS UR ANSWER

L = 28 , S = 144 , no . of terms = a ( n ) a = ?

The last term of AP ( an ) = 28

The sum of " n " term of the AP ( sn ) = 144

sn = n / 2 ( a + an ) = 144

a / 2 ( a + 28 ) = 144

a + 28 = 144 × 2/ 9

a + 28 = 16 × 2/1

a + 28 = 32

a = 32 - 28

a = 4

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