Mala has a colouring book in which each English letter is drawn two times. She…

GATE · 2004 · CS

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 colour-pairs 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 ?

  1. A.

    9

  2. B.

    8

  3. C.

    7

  4. D.

    6

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