Jambmaths question:
A binary operation$\otimes $ is defined by $m\otimes n=mn+m-n$on the set of real numbers, for all m, n $\in $ R. Find the value of $3\otimes (2\otimes 4)$
Option A:
6
Option B:
25
Option C:
15
Option D:
18
Jamb Maths Solution:
$\begin{align} & m\otimes n=mn+m-n \\ & 2\otimes 4=2\times 4+2-4=6 \\ & 3\otimes (2\otimes 4)=3\otimes 6=3\times 6+3-6=15 \\\end{align}$
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