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a. Sn= 1/2 n (2a+(n-1).b)
10/2 (2.3+(10-1).5)
5 (6+9.5)
5 (6+45)
5 ( 51 )
255
b. Sn= 10/2 (2.3+(10-1).6)
5 (6+9.6)
5 (6+54)
5 (60)
300