-
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
-
Chemistry: Post your doubts here!
The degenerate d-orbitals split because of the existent repulsion between the electrons. This helps to form transition-metal-complexes. While forming a complex with a ligand the d-orbitals interact with the surrounding electron cloud, causing it to become non-degenerate (variable energies). This... -
Chemistry: Post your doubts here!
It's the transition metal ION which needs to have a partially filled d-orbital, not the element in its ground state. Remembering the following definition will help: "A transition element is an element that forms at least one stable ion with a partially filled d-orbital." [Cu forms Cu+(aq) and... -
Mathematics: Post your doubts here!
[Q4] H A P P I N E S S (ii) The 9 letters of the word HAPPINESS are arranged in random order in a line. Find the probability that the 3 vowels (A, E, I) are not all next to each other. [4 marks] Solving the problem via reverse approach; i.e. find the number of arrangements in which A, E... -
Mathematics: Post your doubts here!
There is only 1 G that you can possibly alternate. The 2 Gs are fixed/'attached', so that they're always together. The typical logic of dividing by 3! for the recurring 3Gs doesn't really serve well for this question. Albeit, there are various methods of doing it, I simply outlined mine... -
Dear kirashinagami, Follow the links; they'll definitely help you in paper 72.
Dear kirashinagami, Follow the links; they'll definitely help you in paper 72.- Aarjit
- Profile post comment
-
Mathematics: Post your doubts here!
I recommend you to go through the Examiner's Report: http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_er.pdf Also, you can check out the KhanAcadamy Statistics' playlist for the core concepts... -
no discussing papers before 24 hours; keep your integrity.
no discussing papers before 24 hours; keep your integrity.- Aarjit
- Profile post
-
Longest P&C streak! ;)...
Longest P&C streak! ;) http://www.xtremepapers.com/community/threads/mathematics-post-your-doubts-here.9599/page-160- Aarjit
- Profile post
-
I hope your queries have been solved. :)...
I hope your queries have been solved. :) http://www.xtremepapers.com/community/threads/mathematics-post-your-doubts-here.9599/page-160- Aarjit
- Profile post
-
Mathematics: Post your doubts here!
Simply 'choose' 2 Gs out of 3, and the remaining 7 letters can be completely random! G G _ _ _ _ _ _ _...............[consider GG to be 'attached' together so that it can alternate in 2! ways] n = 2! x 3c2 x 7!.................. [but don't forget that there are 3 recurring Es too!]... -
Mathematics: Post your doubts here!
Variance (V) = n.p.q...... (Remember transforming X ~ B (n,p) to X ~ N (np, npq) where np = μ and npq = σ^2 or Variance?) You have, n =30 , p =0.6, q = 1 - 0.6 = 0.4 V = 30 x 0.6 x 0.4 = 7.2......... :) -
Mathematics: Post your doubts here!
Q6. Permutations and Combinations (i) Find the number of different ways that a set of 10 different mugs can be shared between Lucy and Monica if each receives an odd number of mugs. [3] The possible distributions between Lucy (L) and Monica (M) are: ...L9M1,...L7M3,...L5M5,..L3M7,..L1M9... -
Mathematics: Post your doubts here!
Draw an ORDERED stem and leaf diagram from the discrete data [n = 21 (odd number)] and use the following formulae: Q1 = [(n+1)/4]th item = 5.5th item now move to the 5th leaf in your stem and leaf plot. Q1 is the average of the 5th and 6th leaf. Q3 = [3(n+1)/4]th item = 16.5th item now move... -
Mathematics: Post your doubts here!
[Q7] Nine cards, each of a different colour, are to be arranged in a line. The 9 cards include a pink card and a green card. (ii) How many different arrangements do not have the pink card next to the green card? [3] It's easier to solve by reversing the question, here's how you do it: The... -
-
Mathematics: Post your doubts here!
That's because z switches back to negative since you do not have ϕ(z) = 0.1480 in the table. That's why you need to solve for ϕ(-z) = 1 - 0.1480 = 0.8520. -
-
-
Mathematics: Post your doubts here!
Having difficulty deciphering it? Must be a Mac OSX snag. Apologies...;)