Question

A family has a bike rack that fits seven bikes, but they only have 5 bikes. How many ways can they fit these bikes on the rack

Answer 1

Answer:

$x=21 ways$

Step-by-step explanation:

From the question we are told that:

Bike space $N=7$

Number of Bike $n=5$

Generally the equation for This combination is mathematically given by

 $x=^NC_n$

 $x=^7C_5$

 $x= \frac{7!}{5!2!}$

 $x= 7*6/2$  

 $x=21 ways$