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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
 one year ago
 one year 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
 one year ago
 one year ago

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cwrw238Best ResponseYou've already chosen the best response.1
if 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
 one year ago

mukushlaBest ResponseYou've already chosen the best response.0
number 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
 one year ago

cwrw238Best ResponseYou've already chosen the best response.1
ok  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
 one year ago

JayDSBest ResponseYou've already chosen the best response.1
this 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.
 one year ago

JayDSBest ResponseYou've already chosen the best response.1
ur also using the nPr way, how would u do it using just permutations?
 one year ago

cwrw238Best ResponseYou've already chosen the best response.1
nPr means number of permutations of r in n and = n! / r!
 one year ago

JayDSBest ResponseYou've already chosen the best response.1
hmm, so it's basically the same?
 one year ago

cwrw238Best ResponseYou've already chosen the best response.1
yea  oh ill check on that formula  not sure if its right is it correct?
 one year ago

JayDSBest ResponseYou've already chosen the best response.1
i think it's nPr=n!/(nr)!
 one year ago

cwrw238Best ResponseYou've already chosen the best response.1
yup  you r right  my memory failed me there and nCr  n! / r! * (nr)! right?
 one year ago

cwrw238Best ResponseYou've already chosen the best response.1
a quick way of calculating say 5C2 is 5*4  2*1 i.e. number of digits in top and bottom are the same
 one year ago
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