Q. 215.0( 2 Votes )

# Using the d

For the number to be greater than 20000 there are only two possibility.

Case 1: When numbers start with 2. 5th place will be fixed with 2.

Remaining four places can be filled in 4! ways now.

So total number of ways fir a number to start with 2 is 4! = 4× 3× 2× 1

= 24 ways

Case 2: When numbers start with 3. 5th place will be fixed with 3.

Since number is repeating so we use the formula .

Here p1= 2 as number 2 is repeated two times.

Now the remaining places can be filled in ways. = 12 ways

So total ways = 24 + 12

= 36 ways

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