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Barisan bilangan = 3, 7, 11, 15, 19, ...
a = U1 = 3
b = U2 - U1 = 7 - 3 = 4
Ditanya :
Un = ?
U15 = ?
Penyelesaian :
Un
= a + (n - 1)b
= 3 + (n - 1)4
= 3 + 4n -4
= 4n - 1
U15
= 4(15) - 1
= 60 - 1
= 59