help with math question (1 Viewer)

[lovepink]

a rugby union squad has 12 forwards and 10 backs in traning. a team consists of 8 forwards and 7 backs how many different teams can be chosen from the squad

 

[norwegianwood]

(12x11x10x9x8x7x6x5) over (8x7x6x5x4x3x2) = 495
(10x9x8x7x6x5x4) over (7x6x5x4x3x2) = 120
495 x 120 = 59400

 

[lovepink]

thanks !

 

[lovepink]

do you know this one.

win lotto you must correctly select the six correct winning numbers from a possible 24 numbers. to increase their chances of winning some players take a systems entry. This means selecting more than six numbers. for example a system 7 is where 7 numbers are chosen and is equivalent to all combinations of six numbers that can be chosen within 7. find the probability of winning lotto if
i. a system 7 entry is played
ii. a system 8 entry is played
iii. a system 15 entry is played

 

[Makematics]

you're telling me there are perms n combs in general?

 

[HeroicPandas]

you're telling me there are perms n combs in general?

LOOOOOL! i thought that same lol

 

[lovepink]

you're telling me there are perms n combs in general?

LOOOOOL! i thought that same lol

omg. gtfo

 

[albertcamus]

you're telling me there are perms n combs in general?

Yeah I know lool

When I saw the question I automatically went 12C8 x 10C7

Then I was like...General wtf...

 

[Makematics]

omg. gtfo

nonono im not mocking general, im just rlly surprised considering that perms and combs have been the downfall of many talented 3U mathematicians.

 

[girlworld_club]

is this topic in 2 unit?

 

[Makematics]

is this topic in 2 unit?

nope !

 

[Peeik]

Perms and Combs is in general maths. They should know how to use the nPr and nCr notation. The only difference is that general students deal with smaller numbers whereas 3U and 4U students deal with larger numbers. Funnily enough, only 2U students have no idea what perms and combs are haha

 

[lovepink]

whats nPr and nCr

 

[RealiseNothing]

Perms and Combs is in general maths. They should know how to use the nPr and nCr notation. The only difference is that general students deal with smaller numbers whereas 3U and 4U students deal with larger numbers. Funnily enough, only 2U students have no idea what perms and combs are haha

I find this utterly hilarious for some odd reason haha.

 

[anomalousdecay]

Yeah the funny thing was we had students drop ext.1 due to perms and combs and then they were so bad at 2-unit that they were forced to drop.
Then I told them that they could have had the capability of 4-unit if they tried harder, because half our ext.1 class got there.

 

[lovepink]

somebody pls answer my question whats nPr and nCr

 

[nerdasdasd]

somebody pls answer my question whats nPr and nCr

Google is your best bet. "nPr maths"