Sam has 12 black-and-white photos and 18 color photos. he wants to put the photos in equal rows so each row has either black-and-white photos only or color photos only. in how many rows can sam arrange the photos

a)

b)

Step-by-step explanation:

From the question we are told that:

Number Teachers

Number Student

Number in committee

a) Generally the equation for exactly 3 students on the committee is mathematically given by

b) Generally the equation for at least one teacher and at least one student on the committee is mathematically given by

Total Ways-(no of ways of selection no teacher or student)

Where total Ways

Therefore