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The number of 4 digit numbers that can be formed from the digits 0, 1, 2, 3, 4, 5, 6, 7 so that each number contain digit 1 is (a) 1225 (b) 1252 (c) 1522 (d) 480
Asked by aliencpr31 | 28 Jul, 2019, 18:17: PM
answered-by-expert Expert Answer
After placing 1 at one of the four places, the rest of the 3 places can be filled in 7P3 ways
We need to subtract the no. of ways where the 4th digit is zero and that is 6P2 ways
Hence, th no. of ways of forming 4-digit number so that each number contain 1 is 7P3 - 6P2 = 480 ways
Answered by Renu Varma | 30 Jul, 2019, 10:44: AM

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