Brain Teasers
If a quantity grows by 10% twice, is the total growth more or less than 20%?
More; 21%
What's the difference between a stack and queue?
LIFO vs. FIFO
What does "real" mean in real interest rates?
Adjusted for inflation
What is the sum of interior angles of a triangle?
180˚
How many handshakes occur if 20 people shake hands once each?
20C2 = 190 handshakes
What Python structure keeps data in key-value pairs?
Dictionary
What does price elasticity measure?
Responsiveness to price
log28192
13
What is the probability of drawing two aces without replacement?
4/52 * 3/51 = 1/221
What is recursion?
Self-calling function with base case
Diversification, Risk Transfer (insurance), Mitigation/Reduction (emergency funds)
What is the sum of interior angles of a pentagon?
540
How many ways can 5 people sit around a round table?
(5 - 1)! = 4! = 24
What does regularization prevent?
overfitting
If you invest $100 into an asset that yields 10% a year, how much will you have in 10 years?
1.1^10 * 100 = ~$259
How can you compute variance from standard deviation?
Var = StdDev^2
An ant sit on the corner of a tetrahedron (4 sides). It's home is on another corner. It would like to walk home but it is drunk and moves randomly. How many sides will it walk before it gets home?
E0 = ( 2E0 + E1 ) / 3 + 1
E1 = 0
E0 = 2/3E0 + 1 => 3
What is a confusion matrix?
classifier performance (T/F positives/negatives)
What assumption underlies efficient market theory?
Information is reflected in prices
Sum from 1 to n?