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lalaly

  • 4 years ago

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  1. lalaly
    • 4 years ago
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  2. anonymous
    • 4 years ago
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    a) 6435

  3. lalaly
    • 4 years ago
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    ok what abt (b) 2)

  4. anonymous
    • 4 years ago
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    b2) would be 12c5 - 9c5 .. total number of ways of selection - number of ways when he selects no book from the author ..

  5. lalaly
    • 4 years ago
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    :D:D

  6. anonymous
    • 4 years ago
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    b) 1) 792

  7. lalaly
    • 4 years ago
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    do u know how to do the rest? i mean c

  8. anonymous
    • 4 years ago
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    okk c1) would be (26C2 - 26) * (899) * 26 C2) would be 9/899

  9. ash2326
    • 4 years ago
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    _ _ _ _ _ _ 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

  10. ash2326
    • 4 years ago
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    don't you have answers??

  11. lalaly
    • 4 years ago
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    unfortunately no

  12. anonymous
    • 4 years ago
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    What does between 100 and 899 means? Interval is closed or open?

  13. ash2326
    • 4 years ago
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    how is 100 to 999- 899 no.s it's 900 no.s

  14. anonymous
    • 4 years ago
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    ohh i didnt see the restriction on letters .. but the concept remains the same .. :)

  15. lalaly
    • 4 years ago
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    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

  16. anonymous
    • 4 years ago
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    I second ash's answer, it seems correct.

  17. anonymous
    • 4 years ago
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    @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.

  18. anonymous
    • 4 years ago
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    I messed it .. I didn't see that there were restrictions on number of letters (I assumed they were 26) ...

  19. anonymous
    • 4 years ago
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    ah fine then :)

  20. Zarkon
    • 4 years ago
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    do the first two letters have to be different?

  21. anonymous
    • 4 years ago
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    btw ash's answer assumes that the first two letter is different.

  22. Zarkon
    • 4 years ago
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    that is why i asked

  23. lalaly
    • 4 years ago
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    can we make two assumptions? does it mean it has two answers?

  24. anonymous
    • 4 years ago
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    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.

  25. lalaly
    • 4 years ago
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    Thankyou guys you are all awesome !!!!!!

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