The problem
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In the solution it states 2^4-1. Where did the minus 1 come from?
Answer provided by our tutors
In the equation bellow we divide both, the numerator and denominator by 2:
Since (2^4 x^6 y^6) is divided by 2 this means that 2^4 is divided by 2.
2^4 : 2 = 2^(4 - 1)
And that is where the '-1' in the exponent came from.