in apizza resturant ,you got abasic pizza with two toopings cheese and tomato.you can also make up your own pixzza with extra toppings.you can also choose from ten different toopings. eg;olives,ham,mushrom,salami etc..rose want to order a pizza with two different extra toopings..in how many different combinations are possible.
options
a)100
b)1024
c)45
d)90

• 2 ways to select from 10 options
  10c2=45
• 11 years agoHelpfull: Yes(26) No(3)
• why not 90?
  I mean he has 10 choices for 1st topping and 9 for the second one
  so total should be 10*9=90
• 11 years agoHelpfull: Yes(8) No(1)
• ans is 45
  becoz we have to choose 2 out of 10 diff toopings.......
  10c3....
• 11 years agoHelpfull: Yes(3) No(0)
• 10P2 = 90 or 10c2*2! = 90 Ans.
• 11 years agoHelpfull: Yes(2) No(1)