Answer:
(15C5)(14C5)
Step-by-step explanation:
(14 over 5) · (15 over 5)
= 14·13·12·11·10/5! · 15·14·13·12·11/5!
= 6012006
(n over k) is the Binomial coefficient
a 20 times
6 inches per year
The drawing will help