Study the given pattern carefully and select the number

that can replace the question mark (?) in it. (4, 2, 6) (9, 3, 9) (24, 6, ?) (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)