Question

here are 18 students in Mr.Alvarez'S art class. Throughout the year every student must pair up with every other student to complete a project. How many projects will be finished?
149
153
171
125

Answer 1

9? If every student has a partner, then you would divide the total amount of students by 2.

Answer 2

Well one of th answers has to be 149, 153, 171, 125

Answer 3

ok, lets assume there are only 3 students, then total no. of projects = 2+1 = 3
for 4 students, total number of projects = 3+2+1.= 6
similarly for 18 students it will be
17+16+15+.....+2+1 = ??

Answer 4

51

Answer 5

how? no.

Answer 6

Oh

Answer 7

its 17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1=?
or u can do
17*(17+1)/2

Answer 8

Oh ok I see now thanks

Answer 9

welcome ^_^