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In how many ways can 5 colours be select...

In how many ways can 5 colours be selected out of 8 different colours including red, blue, and green : a) if blue and green are always to be included (b) if red is always excluded. (c) if red and blue are included but green excluded.

A

`m = 20`

B

`n = 21`

C

`p = 10`

D

None of these

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The correct Answer is:
A
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