In this task, you need to provide the correct option for a given problem on probability from the provided options.

Input: Consider Input: Problem: what is the probability of randomly selecting an arrangement of the letters of the word ' ' mediterranean ' ' in which the first letter is e and the last letter is r ?
Options: a ) 1 / 13 , b ) 1 / 20 , c ) 1 / 26 , d ) 1 / 50 , e ) 1 / 100

Output: c

Input: Consider Input: Problem: a box contains 24 electric bulbs , out of which 4 are defective . two bulbs are chosen at random from this box . the probability that at least one of these is defective is
Options: a ) 4 / 19 , b ) 7 / 19 , c ) 12 / 19 , d ) 24 / 77 , e ) none

Output: d

Input: Consider Input: Problem: a fair coin is tossed 15 times . what is the probability of getting more heads than tails in 15 tosses ?
Options: a ) 1 / 2 , b ) 63 / 128 , c ) 4 / 7 , d ) 61 / 256 , e ) 63 / 64
Output: a