Mathematics for IGCSE & O level - Sequences (Section 1 - No. 31)
For the sequence 1, 4, 7, 10, ... the term-to-term rule is to add 3. Which of these is the formula for the nth term?
3n + 1
3n - 2
2n + 1
n + 3
Объяснение
Using the formula: T_n = a + (n-1)d -> 1 + (n-1)*3= 3n -2