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a 10 digit number, which can include any number from 0 to 9. the first digit shall only be 6,7,8,9 and in the whole 10 digit number no digit should be repeated more than 4 times. like it's upto 4 repetitions of any number are allowed. how many such possible 10 digit numbers exist?
Permutation and combination question : a 10 digit number, which can include any number from 0 to 9. the first digit shall only be 6,7,8,9 and in the whole 10 digit number no digit should be repeated more than 4 times. like it’s upto 4 repetitions of any number are allowed. how many such possible 10 digit numbers exist?
Lemonade A has a lemon acid to water ratio of 1:4, and Lemonade B has a lemon acid to water ratio of 1:5. In a mixture combining the two lemonades, the lemon acid to water ratio is 9:41. What is the ratio of the amount of Lemonade A to the amount of Lemonade B in this combined mixture?
Lemonade A has a lemon acid to water ratio of 1:4, and Lemonade B has a lemon acid to water ratio of 1:5. In a mixture combining the two lemonades, the lemon acid to water ratio is 9:41. What is the ratio of the amount of Lemonade A to the amount of Lemonade B in this combined mixture?