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4 -(1/2 × 9-1)
4 - (1/2 × 8)
4- 4
=0
b = U2-U1= 3 1/2 -4 = -1/2
U9=a+(n-1)b = a+ 8b
= 4 + 8. -1/2
= 4 -4 = 0