anonymous
  • anonymous
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Mathematics
katieb
  • katieb
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Adi3
  • Adi3
wht do u think
imqwerty
  • imqwerty
nPr=n!/(n-r)! . 1) 6!/(6-3)!=6*5*4=120 . 2) 2/6 * 120 = 40 . 3) 2/6 * 120 = 40 . 4) 1/6 * 120 = 20
anonymous
  • anonymous
I do not understand the 2.)

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ganeshie8
  • ganeshie8
looks there are 5 questions including the top most question ?
anonymous
  • anonymous
yes yes pls explain each question to me
imqwerty
  • imqwerty
did u understand the third one??
ganeshie8
  • ganeshie8
|dw:1436260927038:dw|
anonymous
  • anonymous
yes @imqwerty there are 2 even #s
anonymous
  • anonymous
@ganeshie8 yes =)
ganeshie8
  • ganeshie8
im just making sure we all are referring to the same question number :)
imqwerty
  • imqwerty
no i missed that 0 question
anonymous
  • anonymous
=)
anonymous
  • anonymous
i do not understand this less than 400
princeharryyy
  • princeharryyy
>>less than 400 :) numbers starting with 2 => keeping two fixed we got two places to fill. => 1way(fixed for 2) * 5ways(to fill the tens place) *4ways(to fill the units place) =>1*5*4 =20 => similarly for numbers starting from 3 => total ways 1*5*4 = 20 total 20+20 = 40 numbers @silverxx

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