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)
(40, 253, 17)
(30, 187, 13)

Logic: Second number is divided by the difference of first and third number which results 11.

As,

(40, 253, 17)

253÷(40-17)=253÷23=11

and

(30, 187, 13)

187÷(30-13)=187÷17=11

Now,

Check option A. (50, 385, 15)

385÷(50-15)=385÷35=11​

So, its correct.

Check option B. (25, 100, 15)

100÷(25-15)=100÷10=10​

So, its not correct.

Check option C. (40, 240, 20)

240÷(40-20)=240÷20=12​

So, its not correct.

Check option D. (17, 77, 9)

77÷(17-9)=77÷8=9.625​

So, its not correct.

Thus, correct option is (a).