Mathematics for IGCSE & O level - Sequences (Section 1 - No. 4)
What is the formula for the nth term of the sequence 10, 13, 16, 19,...?
3n + 7
n + 9
7n + 3
10n + 3
คำอธิบาย
The difference between the terms is 3. So it's likely to include 3n. When n=1, the term is 10. Thus, it must be 3(1) + 7 = 10