(a) there are $n$ chairs in a row. find the number of ways of choosing $k$ of these chairs, so that no two chosen chairs are adjacent. (b) there are 10 chairs in a circle, labelled from 1 to 10. find the number of ways of choosing 3 of these chairs, so that no two chosen chairs are adjacent. (c) there are $n$ chairs in a circle, labelled from 1 to $n.$ find the number of ways of choosing $k$ of these chairs, so that no two chosen chairs are adjacent.

answer/// there is an inverse relationship between price and quantity demanded;

answer: marginal utility of the fourth brownie is 0.

explanation: marginal utility is the addtional utility gained from the consumption of one more unit of a good. it is given by,

so, marginal utility at the 4th unit will be given by

since, the values are not given here, you can simply find marginal utility at fourth unit by subtracting total utility at 3rd unit from total utility at 4th unit.

riley- $3

sean- $4

jake- $8

riley has the absolute advantage.