lalaly
  • lalaly
question
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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lalaly
  • lalaly
anonymous
  • anonymous
a) 6435
lalaly
  • lalaly
ok what abt (b) 2)

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anonymous
  • anonymous
b2) would be 12c5 - 9c5 .. total number of ways of selection - number of ways when he selects no book from the author ..
lalaly
  • lalaly
:D:D
anonymous
  • anonymous
b) 1) 792
lalaly
  • lalaly
do u know how to do the rest? i mean c
anonymous
  • anonymous
okk c1) would be (26C2 - 26) * (899) * 26 C2) would be 9/899
ash2326
  • ash2326
_ _ _ _ _ _ first two spaces can be filled in 7*6 =42 ways the three no.s = 9*10*10=900 ways last letter =19 ways so total no. of combinations 42*900*19 2nd part all three no. same= 9*1*1=9 ways combinations with all three no.s same=42*9*19 probability= 9/900=1/100
ash2326
  • ash2326
don't you have answers??
lalaly
  • lalaly
unfortunately no
anonymous
  • anonymous
What does between 100 and 899 means? Interval is closed or open?
ash2326
  • ash2326
how is 100 to 999- 899 no.s it's 900 no.s
anonymous
  • anonymous
ohh i didnt see the restriction on letters .. but the concept remains the same .. :)
lalaly
  • lalaly
guys im sorry i dont really understand this i havent taken it ever , i just want to teach it to someone, so if u can show me the way
anonymous
  • anonymous
I second ash's answer, it seems correct.
anonymous
  • anonymous
@shaan,>> c1) would be (26C2 - 26) * (899) * 26c1) would be (26C2 - 26) * (899) * 26 I still don't know why are you multiplying by 26 in the last case.
anonymous
  • anonymous
I messed it .. I didn't see that there were restrictions on number of letters (I assumed they were 26) ...
anonymous
  • anonymous
ah fine then :)
Zarkon
  • Zarkon
do the first two letters have to be different?
anonymous
  • anonymous
btw ash's answer assumes that the first two letter is different.
Zarkon
  • Zarkon
that is why i asked
lalaly
  • lalaly
can we make two assumptions? does it mean it has two answers?
anonymous
  • anonymous
Good point zarkon, it's not clear from the problem statement, however as this is PIN i have a feeling that it should be 7*7. Yes lala, answer would be different.
lalaly
  • lalaly
Thankyou guys you are all awesome !!!!!!

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