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a = 2
Un = 50
n = 50/2 = 25
ditanya:
S25 = -----?
Jawab:
a = 2
Un = 50
n = 50/2 = 25
dit:
S25 = -----?
Jawab:
S25= 1/2 x 25 (50 + 2)=650
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