anonymous
  • anonymous
math
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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hartnn
  • hartnn
what have you tried?? (a) If first 3 MUST be answered, then how many are remaining, and how many out of them are to be answered?
anonymous
  • anonymous
oh so its 7c5
hartnn
  • hartnn
thats right :)

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hartnn
  • hartnn
(b) Atleast 4 out of 1st 5, so 2 cases : 4 out of first 4 and another 4 out of another 5 OR 5 out of 1st 5 and another 3 out of remaining 5
hartnn
  • hartnn
** 4 out of first 5 and another 4 out of another 5 OR 5 out of 1st 5 and another 3 out of remaining 5
anonymous
  • anonymous
2c1?
hartnn
  • hartnn
4 out of first 5 = 4C5 4 out of another 5 = 4C5 "4 out of first 5 and another 4 out of another 5" = 4C5 + 4C5 do it similarly for "5 out of 1st 5 and another 3 out of remaining 5"
hartnn
  • hartnn
sorry *** "4 out of first 5 and another 4 out of another 5" = 4C5 * 4C5
hartnn
  • hartnn
woah! 5C4, not 4C5 :P
anonymous
  • anonymous
Omg. 2c1 so far from 5c4. Darn.
anonymous
  • anonymous
Thank you so much @hartnn
hartnn
  • hartnn
so you got it? and welcome ^_^
anonymous
  • anonymous
yes yes =)

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