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n (n+1)
ditanya : U50
50 (50+1) = 50 (51) = 2550
a = 6
n = 50
b = U2- U1
b = 12 - 6 = 6
U50 = 6 + (50-1) 6
U50 = 6 + 49 × 6
U50 = 6+294
U50 = 300
jadi banyaknya suku ke - 50
adalah 300
maaf salah jawabannya