Sn=4n-n Square
. the what is first term and sum of 2 terms second term third term and tenth term is
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Step-by-step explanation:
Sₙ = 4n - n²
First term a = s₁ =4(1) -(1)² = 4 - 1 = 3
Sum of first two terms = S₂ = 4x 2 - 4 = 4
second term a₂ = S₂ - S₁ = 4 - 3 = 1
Third term a₃ = S₃ - S₂ = (4 x 3 - 9) - 4 = -1
The terms are 3, 1, -1
∴ It is in AP with a = 3 and d = -2
∴ fourth term is a₄ = a₃ + d = -1 -2 = -3
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