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Quick and very easy math question.... seriously

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holtadit:
http://freeexampapers.com/Dndex.php?d=TyBMZXZlbC9NYXRoZW1hdGljcyBEIChDYWxjdWxhdG9yKS9DSUUvMjAwNiBOb3Y=&catagory=

Go this link and open:    

4024_w06_qp_2.pdf

Scroll to Q11 and please give me method for the (e) part.

I did this: (25/150 * 10/149) = 5/447 + 5/447 = 10/ 447

BUT the MARKSCHEME gives the following answer : 10/449

astarmathsandphysics:
(25/150 * 10/149) +(10/149*25*150)= 10/447

holtadit:
Thats wrong.... there are two possibilities (25/150 * 10/149) + (10/149 * 25/150) so u get 10/447.

BUT the markschemes shows 10/449

astarmathsandphysics:
I can't tfind the answer to this question on the markscheme.

holtadit:
Look at the examiners report.

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