to apply for the position of photographer at a local magazine , a photographer needs to include 4 or 5 photos in an envelope accompanying the application . if the photographer has pre - selected 7 photos representative of her work , how many choices does she have to provide the photos for the magazine ?
7 c 4 + 7 c 5 = 35 + 21 = 56 the answer is e .
add(divide(factorial(7), factorial(5)), multiply(7, const_2))