Find the nth term U\(_n\) of the A.P. 11, 4, -3, …
A
U\(_n\) = 19 - 7n
B
U\(_n\) = 19 + 7n
C
U\(_n\) = 18 - 7n
D
U\(_n\) = 18 + 7n
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
U\(_n\) = a + (n – 1)d ;
where a = 11 ; d = –7
U\(_n\) = 11 + (n – 1)(–7) = 11 – 7n + 7 = 18 – 7n
Source: Myschool Past Questions Archive (Record #75803)