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base 7

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The multiplication table for the different bases 2013-02-01
sylvia pose la question :
I am having a difficult time trying to figure out how to fill in the multiplication table for the different bases. i don't know how to get the numbers.
Penny Nom lui répond.
A base 7 number and a base 9 number 2009-07-09
koteawarao pose la question :
Find a base 7 three-digit number which has its digits reversed when expressed in base 9.

ans: (281) base 7 and (182) base 9

Harley Weston lui répond.
Base seven 2007-05-19
Dan pose la question :
A number X is converted to base 7 and becomes a four digit number. Its leftmost digit is removed and written again as the rightmost digit. The number thus obtained is twice X. Find the decimal representations of all such numbers X.
Penny Nom lui répond.
A 3-digit number in base 7 has its digits reversed when expressed in base 9. 2007-01-28
Ashley pose la question :
A 3-digit number in base 7 has its digits reversed when expressed in base 9. Find this number.
Penny Nom lui répond.
 
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