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Find the number of all whole numbers for...

Find the number of all whole numbers formed on the screen of a calculator which can be recognised as numbers with (unique) correct digits when they are read inverted. The greatest number formed on its screen is 999999.

Text Solution

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The number can use digits 0,1,2,5,6,8 and 9 because they can be recognised as digits whey they are see inverted.
A number can't beginn with, therefore all numbers having at unit's digit should no be counted. (when those numbers will be read inverted they will begin with).
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