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)

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

(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)

(17, 26, 37)

(170, 197, 226)

Which of the following numbers will replace the question mark (?) in the given series?

$\left[\frac{1}{176}\right],\left[\frac{1}{88}\right], ?,\left[\frac{1}{22}\right],\left[\frac{1}{11}\right]$

The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair.