Teresa and Susan have been given with four cards with four different functions on them.
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Let <span>simplify the equations 
and 
:
</span>
<span>1)
</span>
<span>and
</span>
<span>2)
.
</span>
<span>Equate the coefficients:
</span><span>
</span><span>
.</span>
Then
and mnp=24.
<span />
</span>
<span>1)
</span>
<span>and
</span>
<span>2)
</span>
<span>Equate the coefficients:
</span><span>
</span><span>
Then
<span />