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The probability that Annie has selected the cards numbered 1, 2, and 3 is 
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Step-by-step explanation:
Here, the total number of cards in the set = 10
The cards are numbered as 1,2,3,4,5,...., 10
P(Any event E)  = 
 
P(picking a card with number 1)  = 
Now when the first card is picked, the number of cards left = 10 - 1 = 9
P(picking a card with number 2)  = 
Similarly, P(picking a card with number 3)  = 
So, the total probability  that she has selected card with number 1, 2 and 3 
= 
Hence,  the probability that she has selected the cards numbered 1, 2, and 3 is 