Perm and comb Qs (1 Viewer)

Jojofelyx · Aug 4, 2021

Should the rowing one simply be 8C5 ?
And the other question, B?

laterz laterz · Aug 4, 2021

Jojofelyx said:
Should the rowing one simply be 8C5 ?
And the other question, B?

8C5 seems right to me but I am bad at this topic so don't quote me

Jojofelyx · Aug 4, 2021

laterz laterz said:
8C5 seems right to me but I am bad at this topic so don't quote me

Cheers, how about this question plz, fingers crossed this may be your forte

vishnay · Aug 4, 2021

Jojofelyx said:
Cheers, how about this question plz, fingers crossed this may be your forte

$P(x)=(x-c)^{2}Q(x)\\$
$P'(x)=2(x-c)Q(x)+(x-c)^{2}Q'(x)\\$
$P'(c)=0\\$
$\therefore x=c\ \text{is a root of} \ P'(x)$

Jojofelyx · Aug 4, 2021

vishnay said:
$P(x)=(x-c)^{2}Q(x)\\$
$P'(x)=2(x-c)Q(x)+(x-c)^{2}Q'(x)\\$
$P'(c)=0\\$
$\therefore x=c\ \text{is a root of} \ P'(x)$

tysm

pikachu975 · Aug 4, 2021

Jojofelyx said:
Should the rowing one simply be 8C5 ?
And the other question, B?

2nd one would be 7C5 to pick the males, then 1/2^5 for boys and 1/2^2 for girls = 21/128 (D)

Haven't done this in a while though, but it seemed like binomial probability

Jojofelyx · Aug 4, 2021

pikachu975 said:
2nd one would be 7C5 to pick the males, then 1/2^5 for boys and 1/2^2 for girls = 21/128 (D)

Haven't done this in a while though, but it seemed like binomial probability

Yeah thank you, I realised that I forgot to account for the combinations of boys and girls that could happen, not just the 1 particular set of 5B and 2G in that order.

Perm and comb Qs (1 Viewer)

Jojofelyx

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laterz laterz

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