Question

Q. How many 2-digits numbers can be fomed
from the digits 1, 2, 3, 4 and 5
Assuming that,
(i) Repetition of the digits is allowed ?
(ii) Repetition of the digits is not allowed ?​

Answer 1

Answer:

i)12,13,14,15,21,23,24,25,31,32,34,35,41,42,43,45,51,52,53,54

ii) 11,12,13,14,15,21,22,23,24,25,31,32,33,34,35,41,42,43,44,45,51,52,53,54,55