Question

Rumus suku n barisan 12 14 16

Answer 1

A = 12
b = u3-u2 = u2-u1 = 2
un = a + (n-1)b
     = 12 + (n-1)2
     = 12 + 2n - 2
     = 10 + 2n
atau
2(5+n)

Answer 2

A=12
b=2

Un=bn-(b-a)
Un=2n-(2-12)
Un=2n-(-10)
Un=2n+10