A school has three gates and four staircases from the first floor to t

1.	A school has three gates and four staircases from the first floor to the second floor. How many ways does a student have to go from outside the school to his classroom on the second floor?
Answer» A student can go inside the school from outside in 3 ways and from the first floor to the second floor in 4 ways. ∴ A number of ways to choose gates = 3. The number of ways to choose a staircase = 4. By using the fundamental principle of multiplication, number of ways in which a student has to go from outside the school to his classroom = 4 × 3 = 12

A school has three gates and four staircases from the first floor to the second floor. How many ways does a student have to go from outside the school to his classroom on the second floor?

Answer»

A student can go inside the school from outside in 3 ways and from the first floor to the second floor in 4 ways.

∴ A number of ways to choose gates = 3.

The number of ways to choose a staircase = 4.

By using the fundamental principle of multiplication,

number of ways in which a student has to go from outside the school to his classroom

= 4 × 3 = 12