Solve With Your Logic ^__^

split the answer into three pairs . first two digits are the sum of all three digits .second two digits are (multiply first and second value and swap the answer) . Third Two digits add first and third value then the answer was multiplied by second value

Step 1: 4+6+9=19 :ie 19 is a first pair Step 2: 4 6 = 24 (swap 24 ) = 42 :ie 42 is a second pair Step 3: (4+9) 6 = 78 :ie 78 is a third pair