Q. 58 Mala has a colouring book in which each English letter is drawn two times. She
wants to paint each of these 52 prints with one of k colours, such that the colourpairs
used to colour any two letters are different. Both prints of a letter can also
be coloured with the same colour. What is the minimum value of k that satisfies
this requirement?
(A) 9
(B) 8
(C) 7
(D) 6
Answer: (C)
Explanation:
