tolong tolong help me jawab pakai jalannya plisssssss

U1 = 4
U2 = 7
U3 = 10

a = 4
b = 3

Un = a + (n - 1)b
U15 = 4 + (15 - 1)3
U15 = 4 + 14(3)
U15 = 4 + 42
U15 = 46

Jawabannya B

dik : beda : 3
u1 : 4
jwb : un= a+(n-1)b
u15= 4 +(15-2)3
u15= 4+(14)3
u15= 4+42
u15 = 46