if Sn=4n-n2 then find 3rd term and nth term of A.P
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Given : Sₙ=4n-n²,
To Find : the value of a₃
Solution:
a₃ = S₃ - S₂
=> a₃ = 4*3 -3² - (4*2 -2² )
=> a₃ = 12 -9 - (8 -4 )
=> a₃ = 3 - (4 )
=> a₃ = - 1
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