Aptitude and Reasoning MCQ Questions with Solutions
The number of 6-digit numbers that can be formed from 0, 1, 5, 6, 7 and 8 in which the first digit is not 0 are:
A) 120B) 600
C) 720
D) 800
Answer & Explanation:
B) 600Answer is 600
Step-by-step explanation:
For six digits
___ ___ ___ ___ ___ ___
From given first digit should not zero hence possible way is 5
In first we fill 1 number so for second place possible way is 5
For third 4 digits only possible because for second we use 5 so it is 4
Similarly for fourth 3
fifth 2
sixth 1
Hence 5*5*4*3*2*1=600.