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Q: What is the largest five digit number using digits 7 and 9?

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You get the largest number if you sort the digits, from largest to smallest.

the largest five digit number that can be formed using the digits 7 and 9 is 97,000

874321 is the largest number made from all these digits.

For this type of "the largest number which..." questions, you need to advance from left to right, using the largest possible digit in each case. For the first two digits, that would be 9, for the third digit (the right-most digit), the largest digit which will make this possible is an 8.

9,999,876 is the greatest seven-digit number using four different digits.

Related questions

You get the largest number if you sort the digits, from largest to smallest.

543210

the largest five digit number that can be formed using the digits 7 and 9 is 97,000

874321 is the largest number made from all these digits.

99997

Assign the digits from left to right, using the largest possible digit in each case. Don't forget to reserve an even digit for the last position.

9876543210

972.

99 is the largest two digit number. If I can use the digits anyway I want, then 9 to the 9th power is larger

651

It looks like you're asking what is the largest 4-digit number which has four 4's for digits - with a four digit number using four 4's, there is only one such number: 4444. Maybe I'm not understanding the wording of your question.

For this type of "the largest number which..." questions, you need to advance from left to right, using the largest possible digit in each case. For the first two digits, that would be 9, for the third digit (the right-most digit), the largest digit which will make this possible is an 8.