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n = 100 : 2
= 50
a = 1
b = 3-1
= 2
Sn = n/2(2a + (n-1)b)
= 50/2 (2 x 1 + ( 50-1)2)
= 25 ( 2 + ( 49)2)
= 25 ( 2 + 98)
= 25 ( 100)
= 2500