Question

In an AP given l=28,s=144 and there are 9 terms.find a.?

Answer 1

We know that s=a+L
144=a+28
a=144-28
a=116

Answer 2

HLO MATE HERE IS UR ANSWER

L = 28 , S = 144 no . of term = 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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