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= (3² + (5/2)(3)) - (2² - (5/2)(2))
= 9 + 15/2 + 1
= 35/2
U₂ = S₂ - S₁
= (2² - (5/2)(2)) - (1² - (5/2)(1))
= - 1 + 3/2
= 1/2
beda = U₃ - U₂
= 35/2 - 1/2
= 17