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a= 3
b=1,5
dit :
U10 =.......?
jawab :
U10 = a+ (n-1)b
U10 = 3+ (10-1)1.5
U10 = 3 + 9 x 1.5
U10 = 3 + 13.5
U10 = 16.5
suku ke 10 = 16.5