Mathematics for IGCSE & O level - Sequences (Section 1 - No. 20)
Which of the following is the formula for the nth term of the sequence 5, 8, 11, 14, ...?
3n + 2
2n + 3
5n - 2
n + 3
解释
The difference between each term is 3, so the coefficient of n will be 3. The first term is 5, so substitute 1 for n: 3(1) + 2 = 5