I need some help with two problems. The first, I don't even know how to approach...

Three married couples are seated randomly in a row of six seats. What is the probability that no wife and husband are seating next to one another?

The second problem...

On average, how many chocolate chips should a cookie contain if the probability that a cookie contains at least one chip is to be at least .99?

I'm pretty sure that this is a poisson problem

$\displaystyle

e^{-\lambda}{\lambda^k \over{k!}}

$

where the entire expression is equal to .99, k = 1, and I have to solve for lambda. The problem is that I don't know how to solve for lambda in

$\displaystyle

e^{-\lambda}{\lambda}

$

Can anyone help me?