# Perms and combs (1 Viewer)

#### kkk579

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

#### liamkk112

##### Well-Known Member
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

##### hello
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

##### Well-Known Member
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

#### liamkk112

##### Well-Known Member
Wait how is it 4 tho? isnt it only 2
we can have E _ _ E _ _ _ , _ E _ _ E _ _ , _ _ E _ _ E _ , _ _ _ E _ _ E

#### kkk579

##### hello
we can have E _ _ E _ _ _ , _ E _ _ E _ _ , _ _ E _ _ E _ , _ _ _ E _ _ E
Oh shit right right thank you