Question

Two decks of cards are there. Each deck contains 20 cards, with numbers from 1 to 20 written on them. A card is drawn of random from each deck, getting the numbers x and y What is the probability that log x + log y is a positive integer. Logs are taken to the base 10.
options:
a. 3/200
b. 29/200
c. 7/400
d. 1/50

Answer 1

option d is the answer