In a certain laboratory, chemicals are identified by a colour-coding system. The

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In a certain laboratory, chemicals are identified by a colour-coding system. There are 20 different chemicals. Each one is coded with either a single colour or a unique two-colour pair. If the order of colours in the pairs does not matter, what is the minimum number of different colours needed to code all 20 chemicals with either a single colour or a unique pair of colours?

Options:

A . 7

B . 6

C . 5

D . 8

Answer: Option B

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