Suppose $2, 1 = 9$ $4, 2 = 18$ $5, 3 = 18$ $6, 3 = 27$ then $9, 4 = ?$

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Solution

In the first row: $2, 1 = 9$
$\Rightarrow 21 - 12 = 9$
In the second row: $4, 2 = 18$
$\Rightarrow 42 - 24 = 18$
In the third row: $5, 3 = 18$
$\Rightarrow 53 - 35 = 18$
In the fourth row: $6, 3 = 27$
$\Rightarrow 63 - 36 = 27$
In the fifth row: $9, 4 = ?$
$\Rightarrow 94 - 49 = 45$
Hence, The value of $9, 4 = 45$

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