Question

Example 4: How many different numbers can be formed by using any three out of five digits
1, 2, 3, 4, 5, no digit being repeated in any number?
How many of these will (i) begin with a specified digit? (ii) begin with a specified digit and end
with another specified digit?​

Answer 1

Answer:

The number of 3 digit number that we can form by just using 1,2,3,4 is 4 * 4 * 4 = 64. 24 such numbers can be formed.

{I} depends on how you write it.

{ii} depends on how much you end it.