Permutation and combination
Question::If you have number 0,1,2,3,4,5,6 how many 4 digit number you can formed if repition not allowed??
Solution:
It is simple question,
_ _ _ _
At first place you have only 6 option because zero can't be came at first option. Then at 2nd place you have 6 option and at 3rd you have 5 option and at 4th you will have 4 option so total number can be formed= 6×6×5×4
= 720
It is correct or not??
Solution:
It is simple question,
_ _ _ _
At first place you have only 6 option because zero can't be came at first option. Then at 2nd place you have 6 option and at 3rd you have 5 option and at 4th you will have 4 option so total number can be formed= 6×6×5×4
= 720
It is correct or not??
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