Every day at school, Jo climbs a flight of 6 stairs. Jo can take stairs 1, 2, or 3 at a time. For example, Jo could climb 3, then 1 , then 2 stairs. In how many ways can Jo climb the stairs?
Answer Choices
A. 13
B. 18
C. 20
D. 22
E. 24
Every day at school, Jo climbs a flight of 6 stairs. Jo can take stairs 1, 2, or 3 at a time. For example, Jo could climb 3, then 1 , then 2 stairs. In how many ways can Jo climb the stairs?
Answer Choices
A. 13
B. 18
C. 20
D. 22
E. 24