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​Q22: Question – Paper 1 – November 2018

Helpful Links

Content:

• Probability Trees – Part 1 (example 2)
• Probability Trees – Part 2
• Factorising Quadratics (A = 1) – Part 1
• Factorising Quadratics (A = 1) – Part 2​

Quizzes:

• Probability Trees
• Factorising Quadratics (A = 1)

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Question

22) There are only green pens and blue pens in a box.

 

There are three more blue pens than green pens in the box.

There are more than 12 pens in the box.

 

Simon is going to take at random two pens from the box.

 

The probability that Simon will take two pens of the same colour is ²⁷/₅₅

 

Work out the number of green pens in the box.

[6 marks]

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