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Sn = n/2(2a + b(n-1))
= 10/2 (38.2 -5(10-1))
= 5 ( 76 -5(9)
= 5 (76-45)
= 5 (31)
= 155
b = 33- 38
= - 5
Sn = 10/2 ( 2a + ( n-1) b)
= 5 ( 2 x 38 + ( 10-1) -5)
= 5 ( 76-45)
= 5 ( 31)
= 155