Total number of cards in the deck = 52.
Total number of black suited 10 cards = 2.
∴ Probability of drawing a 10 of a black suit
= \(\frac{total\,number\,of\,black\,suited\,10\,cards}{total\,number\,of\,cards\,in\,the\,deck}\)
= \(\frac{2}{52}\)
= \(\frac{1}{26}\).