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### Brain Teasers : 3-D Path Counting Brain Teaser

##### By: Sal Khan

Extending the path counting to three dimensions

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Forehead Numbers Brain Teaser

##### By: Sal Khan

The perfect logicians are at it again.

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Blue Forehead Room Brain Teaser

##### By: Sal Khan

What happens when 100 perfect logicians have to figure out if they each have a blue forehead?

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Toggler Brain Teaser

##### By: Sal Khan

Separating the truthteller from the togglers!

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Blue Forehead Room Solution

##### By: Sal Khan

Do not watch before Blue Forehead Room. THIS IS THE SOLUTION!

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Liar Truth-teller Brain Teaser

##### By: Sal Khan

How to get correct advice when you can only ask one question from either a liar or a truth-teller (when you don't know who is what)

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Light Bulb Switching Brain Teaser

##### By: Sal Khan

Turning light bulbs on and off.

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Path Counting Brain Teaser

##### By: Sal Khan

Counting paths in a square

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

Vol.2

### Definite integrals : Definite Integrals (part 4)

##### By: Sal Khan

Examples of using definite integrals to find the area under a curve

Indefinite integral as anti-derivative. Definite integral as area under a curve. Integration by parts. U-substitution. Trig substitution.

### Sherwood Progress Report. No. 3: (July 1958 to July 1959)

Sloan Foundation ; New York University, Institute of Fine Arts Library

##### By: Sal Khan, CK-12 Foundation

Solving quadratics through factoring, completing the square, graphing, and the quadratic equation.

### Graphing functions : Ex 3: Graphing a quadratic function

##### By: Sal Khan, Monterey Institute for Technology and Education

Identifying, solving, and graphing various types of functions.

### Theory of Maxima and Minima

##### By: Hancock, Harris, 1867-1944

University of California Libraries ; University of California, California Digital Library Collection ; University of California Libraries

### Exercises in Algebra

##### By: George Edward Atwood
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