According to the question, a pack of 52 cards is given from which 4 are dropped.
By using the formula of probability, we have,
P (E) = favourable outcomes / total possible outcomes
Now find the probability that the missing cards should be one from each suit
We know from well shuffled pack of cards, 4 cards missed out total possible outcomes will be,
$n (S) = {}^{52}C_4 = 270725$
Let E be the event that four missing cards are from each suite
$n (E) = {}^{13}C_1\times {}^{13}C_1\times {}^{13}C_1\times {}^{13}C_1 = 134$
P (E) = n (E) / n (S)
= 134 / 270725
= 2197/20825