mia-murray_60a4eb2d0b907
mia-murray_60a4eb2d0b907
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a1 = 5 r = 3 a20 = a1+19r ---> a20 = 5 + 19*3 ---> a20 = 62 S20 = 20(a1+a20)/2 S20 = 10(5+62) S20 = 670