Q: What is the greatest number that can be created using each odd digit only once?

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

1324

987654

7,543

.961

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

1324

987654

To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.

7,543

Proceed from left to right, using the largest possible digit in each position.

1080, 9989

smallest=1234 greatest=4321

9542

987,654,321

.961

3,162.27766 is the square root of a smallest 8 digit number and thus the greatest integer having the greatest 7 digit square is 3,162. This is because the square of the next integer i. e. 3,163 is going to be an 8 digit number as discussed above. Thus, 3,162 is the required answer. 3162^2 = 9998244.