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JayDS
 3 years ago
14) Juliana has saved her pocket money to buy up to 3 fashion magazines. If there are 5 different magazines to choose from, the number of ways she can buy 1, 2 or 3 magazines is:
A) 90
B) 80
C) 25
D) 70
E) 85
JayDS
 3 years ago
14) Juliana has saved her pocket money to buy up to 3 fashion magazines. If there are 5 different magazines to choose from, the number of ways she can buy 1, 2 or 3 magazines is: A) 90 B) 80 C) 25 D) 70 E) 85

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cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1if she buys 1 its 5 ways 2  5C2 = its 5*4/2 = 10 3 its 5c3 = 5*4*3 / 3*2 = 10 that a total of 25

mukushla
 3 years ago
Best ResponseYou've already chosen the best response.0number of ways she can buy 1 is C(1,5) number of ways she can buy 2 is C(2,5) number of ways she can buy 3 is C(3,5) C(1,5)+C(2,5)+C(3,5)=25

cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1ok  if it depends on the order in which she buys the magazines it is 85  this wasn't mentioned in the question in this case its 5 + 5P2 + 5P3 = 5 + 20 + 60 = 85  permutations not combinatons

JayDS
 3 years ago
Best ResponseYou've already chosen the best response.1this question is under permutations so there should be just a simple way to multiply them but I figured out how it is 85 using nPr, 5P1+5P2+5P3=85 ways.

JayDS
 3 years ago
Best ResponseYou've already chosen the best response.1ur also using the nPr way, how would u do it using just permutations?

cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1nPr means number of permutations of r in n and = n! / r!

JayDS
 3 years ago
Best ResponseYou've already chosen the best response.1hmm, so it's basically the same?

cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1yea  oh ill check on that formula  not sure if its right is it correct?

JayDS
 3 years ago
Best ResponseYou've already chosen the best response.1i think it's nPr=n!/(nr)!

cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1yup  you r right  my memory failed me there and nCr  n! / r! * (nr)! right?

cwrw238
 3 years ago
Best ResponseYou've already chosen the best response.1a quick way of calculating say 5C2 is 5*4  2*1 i.e. number of digits in top and bottom are the same
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