• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. A

    Statistics 1: Post Your Doubts Here

    if you only use 6C3, that is not correct since you're asked to take 4 pegs, not 3. 6C3 is to 'pick the colors'. If 3 colors has been chosen, you need to list all the possibilities of the 4 pegs you obtain with those 3 colors. 4!/2! + 4!/2! + 4!/2! is necessary as it count the total...
  2. A

    Phy practical 33 on 6th Nov

    Electricity popped up in P34, so.. I guess it might be possible for P33 to have electricity? Too bad I'm not good with making the circuit, and I'm very anxious about it. Does anyone have a good video/images to help me make simple circuits, connecting cables in parallel, the current flow, etc...
  3. A

    Mathematics: Post your doubts here!

    Thank you for the explanation, now I understand it! ^^
  4. A

    Statistics P6 : post your doubts here!

    Oh my, now I understand where the 5 comes from! Thanks a lot for your explanation! :D
  5. A

    Statistics P6 : post your doubts here!

    It'd be a great help if anyone can help me on explaining the mark scheme in ON2010 P63 question no. 6(iii). -- http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w10_qp_63.pdf I know someone has posted the 'explanation', but I...
  6. A

    Mathematics: Post your doubts here!

    this is how I did my work, hope it clears your problem! You're asked to find how many 'n' is needed, for P(X>=1) > 0.95 Success is obtained when a person rated 'poor', so p = 0.13 Therefore, it wouldn't be a success if the person rate else than 'poor', so q = 0.87 0.95 < P(X>=1) ---P(X>=1) =...
  7. A

    Mathematics: Post your doubts here!

    Can someone help me with question number 6(iii) in ON2010 P63 ASAP? -- http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w10_qp_63.pdf I tried looking for an explanation but couldn't find one. I'm sorry if this question has been...
  8. A

    Doing AS Level Chemistry?

    Ah, alright... maybe I should browse and go read a few of IGCSE chemistry from now. thank you for the information (:
  9. A

    A level Biology: Post your doubts here!

    Thank you for the explanation :)
  10. A

    A level Biology: Post your doubts here!

    Which process occurs during prophase of the mitotic cell cycle in an animal cell? A. division of centromeres B. formation of chromosomes C. replication of DNA D. separation of centriole I don't get why B is wrong too, despite knowing the fact that D is right too. Isn't the condensation of the...
  11. A

    Chemistry: Post your doubts here!

    thank you! the explanation was very helpful. Q3: D is incorrect because: If you look by the fact of two elements with the same nucleon number, their mass are the same. As I remember, the mass of proton and neutron is considered to be equal. This is what I think. :) Correct me if I'm wrong. B is...
  12. A

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    That's a helpful reply! after a while thinking, now I get it! Thank you very much!
  13. A

    Doing AS Level Chemistry?

    Is it necessary to learn chemistry in IGCSE before taking a step to AS Level Chemistry, to be able to get an A on the exam? Honestly, I have trouble studying chem as I don't understand much. I don't take IGCSE chemistry.
  14. A

    Terrible chemistry teacher....:'(

    oh wow, we have the same problem--and now I'm short in time. internet is your best friend when you can't ask anyone around you. do you have a senior, or a friend that is very good at chem? chemguide.co.uk is a great site, as mentioned by people above. my only suggestion is that you need to do...
  15. A

    P1 MCQ's preparation thread for chemistry ONLY!!!!

    I thought this thread was about P1? :0 I have posted my question regarding P1 in another thread, but I'll post it here too. this question bothers me a lot, I don't understand! Cyanohydrins can be made from carbonyl compounds by generating CN–ions from HCN in the presence of a weak base. In a...
  16. A

    Chemistry: Post your doubts here!

    thanks for the post, i hope i can do well on paper 3 with that (: has anyone had an explanation for my question in the previous page? i hope i'm not rushing for an answer, haha.
  17. A

    Chemistry: Post your doubts here!

    Cyanohydrins can be made from carbonyl compounds by generating CN–ions from HCN in the presence of a weak base. In a similar reaction, –CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an aldehyde and CH3CO2CH3 in the presence of a strong base? A...
View older results
Top