Question

1.
How many number of 3 digits less than 500 can be
formed out of integers 1,2,3,4,5,6?
a) 80 b) 70
c) 60
d) 90

Answer 1

we can form 120 numbers because to form 30 all 3 digit numbers fisher arrange them in ascending order then sort them one by one such as 1 1 1 1 2 1 1 2 2 1 2 3 and so on