Question

A pattern follows the rule "Starting with one, every consecutive line has a number one more than twice the previous line".

1. How many marbles must be in the fourth line?

Answer 1

The fourth line will have 15 marbles

Explanation:

The third line has 7 marbles. So, you double that and add one in order to find the number of marbles in the fourth line.

7*2=14

14+1=15