The n th term of a sequence is T n = 5 + (n -
MATHEMATICS
WAEC 2012
The nth term of a sequence is Tn = 5 + (n - 1)2. Evaluate T4 - T6
- A. 30
- B. 16
- C. -16
- D. -30
Correct Answer: C. -16
Explanation
T4 = 5 + (4 - 1)2; where n = 4
= 5 + (3)2 = 5 + 9
= 14
T = 5 + (6 - 1)2
where n = 6
= 5 + (5)2
= 5 + 25 = 30
T4 + T6 = 14 - 30
= -16
Post an Explanation Or Report an Error
If you see any wrong question or answer, please leave a comment below and we'll take a look. If you doubt why the selected answer is correct or need additional more details? Please drop a comment or Contact us directly. Your email address will not be published. Required fields are marked *