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u8 = 41
u15?
rumus u1 + (n-1) b
u1 + (3-1) b = 11
u1 + 2b = 11
u1 + (8-1)b = 41
u1 + 7b = 41
= u1 + 2b = 11
u1 + 7b = 41
------------------------ -
-5b = -30
=
b = 6
u1 + 2b = 11
u1 + 2(6) = 11
u1 + 12 = 11
u1 = 11-12
u1= -1
u15 = u1+(n-1)b
= -1 + 15-1 x 6
= 13 x 6
u15 = 78
jadi, barisan 15 yaitu 78
cmiiw + smoga mmbantu