Question

How many automobile licence plates can be made if the inscription on each contain two different letters followed by three different digits?

Answer 1

Answer:

Step-by-step explanation:

The combinations were formed from 3 letters (A, B, and C), so n = 3; and each combination consisted of 2 letters, so r = 2.

Answer 2

Answer:

formula:n!/n1!n2!nk!

solution

let a&b be two different letter & x,y&z be three different digit

given

n=5 (a=1,b=1,x=1,y=1,z=1)

a=1

b=1

x=1

y=1

z=1

now

p=n!/a!b!x!y!z!

p=5!/1!1!1!1!1!

p=5*4*3*2*1

p=120

extra : 5!=5*4*3*2*1 & 1!=1