Originally Posted by

**wirefree** Greatly appreciate the suggestions, janvdl.

I have two ensuing unrelated queries:

1) In part (c), did you use Normal approximation to the binomial or computation by using a recursive evaluation of binomial probabilities?

2) Consider three children - A,B, & C - standing in a row playing 'catch the ball'. A can only throw the ball to B and B can only throw the ball to C. The probability of B & C dropping the ball are 'p' & 'q', respectively. What is the expected number of times ball will be thrown by A before it is successfully caught by C?

Look forward to a terse response.

Best,

wirefree