how many four digit numbers can be formed with the help of the digits 3,5,7,0,2,1and 6 if no digit is repeated
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4
Answer:
Total no. of digits =7
No. of ways 4 digit numbers can be formed with repetition =7×7×7×7=2401
No. of ways 4 can be formed with repetition =7×6×5×4=840
Therefore,
No. of ways 4 digit numbers can be formed if atleast one digit is repeated =2401−840=1561
Explanation:
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0
Answer:
7021
3562
0215
.....................
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