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For question 5iii
very clearly explained. thanks a lotFor question 5iii
there are 2 restrictions.
Either both question 1 and 2 of part A or None
If we consider 1st restriction.
Then we take question 1 and 2, and now 4 questions are left (we need total of 6)
No. of questions are 11 take the first 2 we get 9 left to choose 4 from.
therefore
9C4 = 126
Then if we consider 2nd restriction
Then we have to choose 6 from 9 questions ( since we arent allowed with question 1 and 2)
so 9C6 = 84
126 + 84 = 210
For question 5iii
there are 2 restrictions.
Either both question 1 and 2 of part A or None
If we consider 1st restriction.
Then we take question 1 and 2, and now 4 questions are left (we need total of 6)
No. of questions are 11 take the first 2 we get 9 left to choose 4 from.
therefore
9C4 = 126
Then if we consider 2nd restriction
Then we have to choose 6 from 9 questions ( since we arent allowed with question 1 and 2)
so 9C6 = 84
126 + 84 = 210
b (i) For getting a even number u need the number to end with even number (ofc) well in that number we have 2 4 6 8 as even,Can u also help with no 6b n c??? thanx in adv http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_63.pdf
well, first find "n" as followshttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s12_qp_63.pdf
Q 4 part (iii)
Dug
PhyZac
Please help guys
thanks....I completely overlooked the 2/6 part....my brain is fried. I've been at this stuff since 10 amwell, first find "n" as follows
is the expected number is to 8 from n ,therefore, (the prob of getting a 3 ) 2/6 x n = 8
n = 24
now i hope u know this rule, that is npq is variance
n = 24
p = 2/6
q = 1 -p = 1 - (2/6) = 4/6
24 x 2/6 x 4/6 = 5.33
It happens, usually sitting doing a thing completely not related to math will give the hint of the answer.thanks....I completely overlooked the 2/6 part....my brain is fried. I've been at this stuff since 10 am
like pretending you're a fruit fly?It happens, usually sitting doing a thing completely not related to math will give the hint of the answer.
O.Olike pretending you're a fruit fly?
I'm a fruit fly....weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
dy/dx = 6(2x - 3)² - 6http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w07_ms_1.pdf
Q8)i) I did the first derative but a bit confused about the 2nd one, could someone show me how to do it? I think the MS might be wrong.
I'm having trouble with this one too. The last part, could you explain it further please?b (i) For getting a even number u need the number to end with even number (ofc) well in that number we have 2 4 6 8 as even,
now we consider each separtely
with 2 as end
we have 1 44 687
we rearrange 6! / 2! (we permutate 6 and we need to divide with 2 cuz there are 2 4s)
with 6 and 8 as end it is same thing as with 2
so we get 6!/2! and 6!/2!
with 4 as end we wont have 2 4s, so it will be only 6!
now add
6! + (6!/2!)*3 = 1800
i will try to solve rest soon In Sha Allah
b (ii) to get a number between 20 000 and 30 000 we have to start with number 2 and only, (we cant have a number smaller than 30000 starting with 3 ryt!)
so basically we have 2 and 4 blank
2_ _ _ _
so we permutate 4 from the left 5 numbers
we get 5P4 = 120!
(c) wat a tricky one!
anyway,
see, now since all have same prob, u get that each prob is 1/3
so we start any color and then take any of the other two in next shot
I am not sure if u got my point,
so we 1 * (2/3 )^7
first try is one, becuz all is possible..and power is 7 since 8 - 1 = 7
dy/dx = 6(2x - 3)² - 6
d²y/dx² = 6(2)(2x - 3)(2) = 24(2x - 3)
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