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b = U2 – U1
b = 4 – 2 = 2
Un = a + (n-1) b
U100=2 + (100-1) 2
= 2 + 198 = 200
Sn = ½ n (a + Un)
S100 = ½ 100 (2 + 200)
=50 x 202
= 10100