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Sn=n/2 (2a+(n-1)b)
S20=20/2 ( 2.27 + (20-1)-3)
S20 = 10 (54 + (19.-3)
S20 = 10 ( 54 + -57)
S20 = 10 (-3) = -30
12) 24-3 = 21/7 = 3
8-1
maka beda adalah 3