Question

Suku ke-50 dari barisan 20, 17, 14, 11, 8, … adalah

Answer 1

A = 20
b = 17-20
b = -3

U50 = a + 49b
= 20 + 49 x -3
= 20 + -147
= -127

semoga membantu

Answer 2

U1 = 20
U2 = 17

beda = U2 - U1 = 17 - 20 = -3

Un = a+(n-1)b
U50 = 20 + (50-1)-3
U50 = 20+ (49)-3
U50 = 20-147
U50 = -127