Author Topic: Quick and very easy math question.... seriously (Read 2503 times)

holtadit · « **on:** October 20, 2009, 02:31:08 pm »

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 · « **Reply #1 on:** October 20, 2009, 02:47:36 pm »

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

holtadit · « **Reply #2 on:** October 20, 2009, 02:50:35 pm »

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 · « **Reply #3 on:** October 20, 2009, 02:51:10 pm »

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

holtadit · « **Reply #4 on:** October 20, 2009, 02:52:18 pm »

Look at the examiners report.

astarmathsandphysics · « **Reply #5 on:** October 20, 2009, 02:54:16 pm »

Ok I have it. The ms is wrong. They point out we do exactly as we both did above. I corrected my post.

holtadit · « **Reply #6 on:** October 20, 2009, 02:56:53 pm »

phew... so im right ? YIPEE !!!

Thanks again for your help astar (the phy. project was a succes By the way)

astarmathsandphysics · « **Reply #7 on:** October 20, 2009, 03:02:33 pm »

good stuff

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