a1= 3+5= 8
a2= 6+5=11
d= 11-8= 3
S50= (2a1+49d)/2*50= 25*(2*8+49*3)= 4075
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a1= 3+5= 8
a2= 6+5=11
d= 11-8= 3
S50= (2a1+49d)/2*50= 25*(2*8+49*3)= 4075