Question

A sandwich shop offers the toppings shown below. how many 2 topping sandwiches can you make?

ham
turkey
lettuce
tomato
bacon
cheese
mustard

A. 14
B. 21
C. 28
D. 36

Answer 1

@amistre64 @campbell_st @Hero @Michele_Laino @satellite73

Answer 2

i think there is 36

Answer 3

im not sure thogh tell me if im right

Answer 4

so my question is does ham and ham count as a 2 topping sandwich

Answer 5

@smartasssskole, Change your username first.

Answer 6

no

Answer 7

it has to be like ham and letuce or cheese and bacon stuff like that

Answer 8

wow... who's question is it...?

Answer 9

mine

Answer 10

is the answer 36? @campbell_st

Answer 11

I don't think so..?

Answer 12

then can you help me figure out what the answer is

Answer 13

is order important.... as in which topping goes on 1st..?

Answer 14

i dont think so

Answer 15

so is ham and mustard the same as mustard and ham...?

Answer 16

i guess

Answer 17

so if order isn't important.... then you have a combination question, selecting 2 items from 7

Answer 18

do you know about combinations...?

Answer 19

a little bit

Answer 20

the formula is

\[^nC_{r} = \frac{n!}{r!(n - r)!}\]

n = the number of items you select from

r = the number of items you have to select...

your calculator probably has a combinations function.

so you have n = 7 and r = 2

hope it helps

Answer 21

is it 14?

Answer 22

that seems the most obvious solution to me

Answer 23

just do the calculation....

Answer 24

thanks

Answer 25

oops... I ment on how to do the question... and I'd say 14 is also incorrect

Answer 26

oh

Answer 27

i still dont get it, would it be 21???@campbell_st

Answer 28

@Hero

Answer 29

well That's my best guess at an answer

Answer 30

ok, thanks