suku ke -4 dari deret berikut 2/9,1/3,1/2 bantuin buat besok ka

2/9, 1/3, 1/2, ...

a = 2/9
r = U₂ / U₁
r = (1/3) / (2/9)
r = (1/3) × (9/2)
r = 3/2

U₄ = U₃ × r
U₄ = (1/2) × (3/2)
U₄ = 3/4 ✓

atau
Uₙ = a rⁿ⁻¹
U₄ = (2/9) (3/2)⁴⁻¹
U₄ = (2/9) (3/2)³
U₄ = (2/9) (27/8)
U₄ = 3/4 ✓

2/9 * 3/2 = 1/3
1/3 * 3/2 = 1/2
1/2 * 3/2 = 3/4
jdi suku ke 4 adlh 3/4