Question

9A sequence is given by u1 = 1 , u2 = 3 , u3 = 5 , u4 = 7 , …
(a) Find a formula for un, the nth term.

Answer 1

Answer:

by general formula a + (n-1)d

Step-by-step explanation:

a=1 ,d=3-1=2

nth term will be

nth = 1 + (n-1) 2

= 1 + 2n-2

nth =2n-1