WAEC 2025
Find the nth term U\(_n\) of the A.P. 11, 4, -3, …
- AU\(_n\) = 11 - 7n
- BU\(_n\) = 19 + 7n
- CU\(_n\) = 18 - 7n
- DU\(_n\) = 18 + 7n
Explanation
The nth term of an A.P. is given by U_n = a + (n - 1)d. Here, the first term a = 11 and common difference d = 4 - 11 = -7. Substituting these yields U_n = 11 + (n - 1)(-7) = 18 - 7n.
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