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A base-10 integer n = 4d_9 = d0_7, where d represents a single digit. What is the value of n?

 Nov 21, 2021
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4d9    =  d07

4 *9  + d   =  d *7  + 0

36 + d = 7d

36 = 6d

d = 6

 

 

4*9 + d = 4* 9 + 6 = 4210

 Nov 21, 2021

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