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I'm an IGCSE Maths Teacher - Post your questions here.

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Sam Ivashkov

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notnek01 said:
Where did you get that formula from? Did you work it out yourself?

It is easier to look at the sequence and see the pattern:

0, 2, 5, 9, 14, ...

The difference are 2, 3, 4, 5, ... so the sequence continues like this:

0, 2, 5, 9, 14, 20, 27, 35, 43, ...

And you can use this pattern to work answer a and b.


c)

You already know the formula: number of diagonals = n/2(n-3)

So comparing this with 1/p * n (n-q), you can see that p = 2 and q = 3.


If you didn't know the formula already, to find p and q, substitute some values of n into the formula e.g. for n=3 you know the number of diagonals is 0 so:

3/p (3-q) = 0

And you could do the same for e.g. n=4 and use your equations to find p and q.
Click to expand...

but how will i find the values of p and q at the same time? are you suggesting the use of simultaneous equations? :/
 
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Noorullah Farid

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mak kings

mak kings

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Noorullah Farid said:
well median mode is 8,median 9,mean is 10 and 16 is largest so
_ _ _ _ _ 16
_ _ x y _ 16
x+y/2 must be 9
_ _ 8 10 _ 16
mode is 8 so another 8 must exist
_ 8 8 10 _ 16
mean is so
z 8 8 10 w 16
z+8+8+10+w+16 must be equal to 60
so only 2 choice z=8 and w=10
or z=7 and w=11
note z must be grater than 6
Click to expand...
1.y did u take mode only 2 times.. there can be many
2.y only 2 choices?... wat abt..9 + 9
 
N

Noorullah Farid

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mak kings said:
1.y did u take mode only 2 times.. there can be many
2.y only 2 choices?... wat abt..9 + 9
Click to expand...
well 9+9 not possible as then it would be
8+8+9+9+x+16
but this way 8 is not the mode
well they said 2 set
so 7,8,8,10,11,16
and 8,8,810,10,16
only possible choice, in this one i took 3 eights
 
ZaqZainab

ZaqZainab

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uzair shahid said:
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_42.pdf
Q3d please explain.
Click to expand...
this is so confusing but i will tell ya what i am thinking the probability of not getting a 2 is (4/6) for 1 spin s for how many spins will it be 1-(16/243) after this you will get 2
(4/6)^x=227/243
now slove this you get x as 5.9 bla bla and they have mentioned not to round so 5 Lol i agree not an appreciating answer sorry i couldn't figure out any other way
 
uzair shahid

uzair shahid

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ZaqZainab said:
this is so confusing but i will tell ya what i am thinking the probability of not getting a 2 is (4/6) for 1 spin s for how many spins will it be 1-(16/243) after this you will get 2
(4/6)^x=227/243
now slove this you get x as 5.9 bla bla and they have mentioned not to round so 5 Lol i agree not an appreciating answer sorry i couldn't figure out any other way
Click to expand...
but how can we get the exact answer 5,?
 
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