Data Scientist

You are playing a card game with three cards. Both sides of one card are black, both sides of another are white, and the remaining card has one black side and one white side. You pick a card at random and see it has a black side face-up. What is the probability that the other side of the card is white?
How many edges does a fully connected (or complete) graph have? 
What is the fundamental difference between k-means clustering and KNN?
Which command would be used to ensure any local tracked changes are also shared amongst remote repositories? 
Given 2 fair 6-sided dice and a fair coin, what is the probability of rolling a combined score of 7 with the dice and having the coin show heads after tossing? 
Given data matrix X of shape n x d and transformation matrix sigma of shape d x k, which matrix multiplications will produce a transformed data matrix Xdash of shape n x k?
The sigmoid function is defined. What does its value tend to as its input x moves towards negative infinity?

SQL challenge of 2 tables with example answer, typed answer in SQL language of choice required
'Descending Mount Trigonometry' question - code your own answer