Perms and combs (1 Viewer)

[kkk579]

How do i do part c? the answers r next to the q

 

[liamkk112]

How do i do part c? the answers r next to the qView attachment 42962

for i), group E_E, where _ is any other letter.
firstly there are 5 places to put the E_E (draw it out to see why)
then, there are 5! ways to put the other 5 letters
so in total there are 5 x 5! ways

similar idea for the others, you just need to draw it out to determine how many places you can put the E's (there are 4 for E__E, 3 for E___E, 2 for E____E, 1 for E_____E) then multiply by 5! for placing the remaining letters

 

[kkk579]

for i), group E_E, where _ is any other letter.
firstly there are 5 places to put the E_E (draw it out to see why)
then, there are 5! ways to put the other 5 letters
so in total there are 5 x 5! ways

similar idea for the others, you just need to draw it out to determine how many places you can put the E's (there are 4 for E__E, 3 for E___E, 2 for E____E, 1 for E_____E) then multiply by 5! for placing the remaining letters

Yeah thats what i did and it worked for i but for ii i kept getting 240 and idk where i went wrong

 

[liamkk112]

Yeah thats what i did and it worked for i but for ii i kept getting 240 and idk where i went wrong

4x5! = 480 tho

 

[kkk579]

4x5! = 480 tho

Wait how is it 4 tho? isnt it only 2

 

[liamkk112]

Wait how is it 4 tho? isnt it only 2

we can have E _ _ E _ _ _ , _ E _ _ E _ _ , _ _ E _ _ E _ , _ _ _ E _ _ E

 

[kkk579]

we can have E _ _ E _ _ _ , _ E _ _ E _ _ , _ _ E _ _ E _ , _ _ _ E _ _ E

Oh shit right right thank you