A population of rabbits, if left unchecked, will triple every 3 months. If there are initially
only 2rabbits, how many will there be in a year and a half?
If the population of rabbits triples every 3 months, we can divide the 1 year and 6 months into 6 periods of 3 months each.
After the first 3 months, the population will be 2 * 3 = <<2*3=6>>6 rabbits.
After the second 3 months, the population will be 6 * 3 = <<6*3=18>>18 rabbits.
After the third 3 months, the population will be 18 * 3 = <<18*3=54>>54 rabbits.
After the fourth 3 months, the population will be 54 * 3 = <<54*3=162>>162 rabbits.
After the fifth 3 months, the population will be 162 * 3 = <<162*3=486>>486 rabbits.
After the sixth 3 months, the population will be 486 * 3 = <<486*3=1458>>1458 rabbits.
Therefore, after a year and a half, there will be 1458 rabbits.