Suku ke50 dari barisan bilangan 3,5,7,9,...

Un = a +(n-1) . b
U50 = 3 + ( 50-1 ) . 2
= 3 + 49 . 2
= 3 + 98
= 101

semoga membantu

a = 3
b = 2
u = 50

a + (u - 1) × b
= 3 + (50 - 1) × 2
= 3 + 49 × 2
= 3 + 98
= 101