Question 1208459
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(6*5*4*3) * (6*5*4*3) = 360 * 360 = 129600.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>


First multiplier  &nbsp;(6*5*4*3)  &nbsp;is for &nbsp;4-letters block made of &nbsp;6 &nbsp;different non-repeating letters.


Second multiplier  &nbsp;(6*5*4*3)  &nbsp;is for &nbsp;4-digits block made of &nbsp;6 different non-repeating digits.