Question

how many two digit number can be formed using 1,2,3,4,5 without re​

Answer 1

Answer:

ghbjtcnfnv t fbfrdhfrjt fjfutncti mgcgdhtyvf hvdfvdkyb it turt

Step-by-step explanation:

bjrvucrbjrvjfb dv

Answer 2

Answer:

25

Step-by-step explanation:

Forming a 2-digit number is same as finding the 2-digit number and also it includes the arrangement of numbers.

So, we can get the number of ways to form 2-digit number from the given set by using permutation.

Here, we have 5 digits and we need to choose 2-digits.

Then, the number of 2-digit numbers formed from the given set without repetition is

5

P

2

=

(5−2)

5

=

3!

5!

=20

The numbers formed by repetition are {11,22,33,44,55}

∴ The number of 2-digit numbers formed from the given set with repetition =

5

P

2

+5=20+5=25