How does GS make its revenues?

there is n steps and each time a rabbit can jump either 1 or 2 step. how many way to reach the top

Flip a coin until either HHT or HTT appears. Is one more likely to appear first? Can you draw a graph to show it?

Given a basket of 5 independent stocks where the probability density function for the daily change in price of each stock is described by an N(0,1) distribution, determine the PDF of the entire basket.

what different multiples I would use for different type of companies.

Two lines of ants move toward each other on a platform. For each single ant, it changes its direction when it hits another ant. What happens in the end and when does that happen?

If you were to price a bond in an emerging market, what would be the process by which you would do so, and what risks would you consider?