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**GCSE** **Mathematics**** Question Analysis Topic: Mathematics - Probability**

A card is picked at random from a pack of 52 playing cards. Given that the picked card is a queen, the probability of this card to be a card of spade is:

**Answer:**

For GCSE Mathematics, you should know:

The number of spade cards is 13.

The number of queens in a spade set is only 1.

Therefore n(spade queen) = 13_{C1}

n(Total number of cases) = 52_{C1}

P(spade queen) = 13_{C1}/52_{C1} = 13/52 = 1/4

The probability is 1/4.

Work hard for your GCSE Mathematics examination!

End of analysis. Great!