1. (a) Create a question related to playing cards for which the expression .Ca(0.25)3(0.75) will give you the probability. (b)Explain how each part of your question relates to the expression. (c) Explain why the formula shown is appropriate. (No calculations required.) 2. Use Pascal's Identity to write an expression equivalent to 23, + 23 Co- 3. Calculate the number of routes that lead from your home (point A) to the grocery store (point B) if you are allowed to move only west and north along the streets