How do I calculate chances?

If there s 100 cards and 10 are my cards, how big is my chance to get the right card twice in a row?

If there s 100 cards and 30 are my cards, how big is my chance to get the right card 3 times in a row?

?2017-08-21T11:30:48Z

i) P = 1/100
ii) P = 27/1000

Fizzabel2017-08-20T23:56:36Z

Multiply the probabilities. So the first one would be 0.1 x 0.1 (if you replace the card)