Question
Mathematics Question on permutations and combinations
The number of 4 digit numbers that can formed by using the digits 1,2,3,4,5,6,7,8 and 9 such that the least digit used is 4,when repetition of digits is allowed
A
617
B
671
C
716
D
761
Answer
671
Explanation
Solution
The correct option is (B): 671