American Express Management Trainee interview questions

How many attempts would be required to find two working batteries in a set of 8 in which 4 are working 4 aren't? You can test batteries with a flashlight that switches on only with two working batteries.

1000 merchant terminals to be installed across food outlets. Which of the two strategy options would you choose, and what parameters would you consider? 1. Fast Food chain - low ticket size, high number of transaction 2. Niche Restaurants - high transaction value, low in numbers