Find the missing number in the following figure.

The correct answer is Option (3) → 42

In each figure the centre number is the product of one diagonal minus the product of the other: (top-left × bottom-right) − (top-right × bottom-left).

• First figure: \(16\times4-3\times8=64-24=40\)

• Second figure: \(20\times3-5\times4=60-20=40\)

• Third figure: \(18\times4-5\times6=72-30=42\)