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 /deleting /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.)

(3, 5, 30)
(6, 5, 60)

In each set, double of the product of the first and second numbers is done to obtain the third number.

(3, 5, 30)

third number = $$2\times first\ number \times second\ number$$

= $$2\times3\times5$$

= 30

(6, 5, 60)

third number = $$2\times first\ number \times second\ number$$

= $$2\times6\times5$$

= 60

Option (a) (4, 6, 38)

third number = $$2\times first\ number \times second\ number$$
= $$2\times4\times6$$

= 48

The above given logic is not applicable here. So this is not the correct answer.

Option (b) (6, 7, 84)

third number = $$2\times first\ number \times second\ number$$

= $$2\times6\times7$$

= 84

The above given logic is applicable here. So this is the correct answer.

Option (c) (4, 7, 28)

third number = $$2\times first\ number \times second\ number$$

= $$2\times4\times7$$

= 56

The above given logic is not applicable here. So this is not the correct answer.

Option (d) (3, 9, 44)

third number = $$2\times first\ number \times second\ number$$

= $$2\times3\times9$$

= 54

The above given logic is not applicable here. So this is not the correct answer.