IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE O - Level => Math => Topic started by: holtadit on October 20, 2009, 02:31:08 pm

Title: Quick and very easy math question.... seriously
Post by: 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

Title: Re: Quick and very easy math question.... seriously
Post by: astarmathsandphysics on October 20, 2009, 02:47:36 pm

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

Title: Re: Quick and very easy math question.... seriously
Post by: holtadit 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

Title: Re: Quick and very easy math question.... seriously
Post by: astarmathsandphysics on October 20, 2009, 02:51:10 pm

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

Title: Re: Quick and very easy math question.... seriously
Post by: holtadit on October 20, 2009, 02:52:18 pm

Look at the examiners report.

Title: Re: Quick and very easy math question.... seriously
Post by: astarmathsandphysics 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.

Title: Re: Quick and very easy math question.... seriously
Post by: holtadit 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)

Title: Re: Quick and very easy math question.... seriously
Post by: astarmathsandphysics on October 20, 2009, 03:02:33 pm

good stuff