From the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, find the number of seven digit combinations.
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Seven digits from numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 are written in random order. The probability that this seven-digit number is divisible by 9 is\[\dfrac{k}{9}\] find k?Answer
Hint: Complete step by step answer: Note:
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What is a 7 digit number?The smallest 7-digit number is 1 followed by 6 zeros. This number is called one million. The largest 7-digit number is 9 followed by another 6 nines. This number is called nine million nine hundred ninety-nine thousand nine hundred ninety-nine.
How many 7 digit phone numbers can be formed if the first digit Cannot be 0 or 1 and any digit can be repeated?Hence, the answer is 106. Was this answer helpful?
How many 7 digit numbers can be formed using 1/2 and/or 3?We know that the factorial can be written by the formula n! =n×(n−1)! Therefore, the number of different seven-digit numbers that can be written using only three digits 1,2 and 3 is 672.
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