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$(70\,\,\,34\,\,\, 3\,)_{81} = (?)_3$

Any trick to solve this type of questions?
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there is no trick its all about concept :

its simple :

for convenience use : (A96)16 <==> ()2

what we do here is plot value of hexadecimal number in terms of binary form. where each value of hex. has 4units . (A96)16 = (1010 1001 0110)2

similary when we convert each value of base 81 in base 3, it will be plotted into 4 units. (34 = 81) as its themaximum space we can give to base 3 when we reduce from base 81.

so, (70 34 3 )81= (2121 1021 0001)3

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