Question

Find the total number of 3 digit numbers that can be formed from 6 digits 2,3,5,6,7 and 9. How

many of these are less than 400?

permutations and combination​

Answer 1

Step-by-step explanation:

    1. 3 digits formed from 2, 3, 5, 6, 7, 9

                               Permutation formula =(n−r)!n!

                                                                  =(6−3)!6! 

                                                            36P=66×5×4

                                                                   =120   

                            2. Numbers less than 400 can start with digits 2 and 3 only.

                                                 2×6×6=72  

Hope you like it !

Answer 2

Answer:

11 13 17 this is the answer thankyou