Full cases worked end to end with the interviewer's evaluation criteria stated up front.
3 questions in Product Management.
Work out who owns the customer after the deal, because that decides whether this is distribution or the slow loss of your product. Price the engineering the partner's requirements will consume, and set the conditions under which you would walk away before you see the revenue figure.
A product market sizing case should define the revenue pool, work top-down from households to willingness to pay, sanity-check penetration, then turn the estimate into a build-or-don't-build recommendation. It also connects estimation to the point an interviewer is testing.
Equal revenue hides unequal quality of revenue, so compare the two on retention, expansion, cost to serve, cost to acquire and headroom, then pick the one whose limiting constraint you can actually change in a year and name the condition that would reverse the choice.