There are three Harry Potter series of $10$ books each. The number of ways of selecting $10$ books if twice as many as first series as second series are to be selected?

3

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4

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6

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8

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Solution

The correct option is B $4$
There are three Harry Potter series books of ten each.

If first series are selected in number $1$ the second series are selected in number $2$

So like this there are totally four chances

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