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U2 = 5 - 3 (2) =5 - 6 = -1
b = U2 - U1= -1 - 2= - 3
sn = 1/2n (2*U1+(n-1)b)
= 1/2*16 (2*2+(16 - 1) - 3
= 8(4 + (15) - 3) = 8(4 + (- 45)
= 8(4 - 45) = 8 ( - 41)
= - 328