Question

satellite73
A student has to sell 2 books from a collection of 6 math, 7 science, & 4 economics books. How many choices are possible if both books are on the same subject.

Answer 1

well they are adding this time because it is "or"

Answer 2

I thought it was 6C2*7C2*4C2 but it's 6C2+7C2+4C2

Answer 3

OHHHHHHHHHHHHH

Answer 4

rigth
one or the other , not both together

Answer 5

I feel dumb...

Answer 6

okay so if all, then *, if or then +

Answer 7

lol it is the translation that is always the hard part. computing is the easy part

Answer 8

it's addition, since it's optional. . (or)

Answer 9

if it was two math books AND two science book AND two whatever, then you would multiply

Answer 10

ok thanks guys.

Answer 11

yw