Which of the following letters will replace the question mark (?) and complete the letter series?
J, D, X, R, L, ?
Select the set in which the numbers are related in the same way as are the numbers of the following set.
NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits.)
(4, 50, 6)
(13, 128, 3)
Select the option in which the given figure is embedded. (Rotation NOT allowed)