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b = 7-4 = 3
ditanyakan = U50?
Un = a+(n-1)b
Un = 4 +(n-1)3
Un = 4 + 3(n-1)
Un = 4 + 3n -3
Un = 3n + 1
U50 = 3n + 1
U50 = 3x50 + 1
U50 = 150 + 1
U50 = 151
Un= a + (n-1)b
jadi 4+(50-1)3
maka 151