Question

If 9 books are to be kept in a 4 shelves there must be atleast one Shelf which contains atleast 3 books​

Answer 1

Answer:

then what is your question

Step-by-step explanation:

what we have to find

Answer 2

Use pigeonholeformula.Taking q1 = q2 = ... = qn = r gives the more quantified version of the principle, namely: Let n and r be positive integers. If n(r - 1) + 1 objects are distributed into n boxes, then at least one of the boxes contains r or more of the objects.