Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
DJ26 EK37 FL48 GM59 ?
Seven people, A, B, C, D, S, T, and U are sitting in a row, facing north.
No one sits to the right of D. Only three people sit between D and S. Only two people sit between S and T. C sits third to the left of U. A sits to the immediate right of U.
How many people sit between B and T?
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number results in the second number. Similarly, certain mathematical operation(s) on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets?
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting / multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
10 - 20 - 30 - 60; 2 - 4 - 14 - 28
