Given is a deck of 52 cards.
By using the formula of probability, we get,
P (E) = favourable outcomes / total possible outcomes
We have to find the probability that all the face cards of same suits are drawn.
Total possible outcomes will be,
$n (S) = {}^{52}C_4$
Let E be the event that all the cards drawn are face cards of same suit.
$n (E)=4\times {}^4C_4=4$
P (E) = n (E) / n (S)
= 4 / 270725