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lalaly
 4 years ago
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lalaly
 4 years ago
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This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0b2) would be 12c5  9c5 .. total number of ways of selection  number of ways when he selects no book from the author ..

lalaly
 4 years ago
Best ResponseYou've already chosen the best response.3do u know how to do the rest? i mean c

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0okk c1) would be (26C2  26) * (899) * 26 C2) would be 9/899

ash2326
 4 years ago
Best ResponseYou've already chosen the best response.0_ _ _ _ _ _ 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
 4 years ago
Best ResponseYou've already chosen the best response.0don't you have answers??

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0What does between 100 and 899 means? Interval is closed or open?

ash2326
 4 years ago
Best ResponseYou've already chosen the best response.0how is 100 to 999 899 no.s it's 900 no.s

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ohh i didnt see the restriction on letters .. but the concept remains the same .. :)

lalaly
 4 years ago
Best ResponseYou've already chosen the best response.3guys 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
 4 years ago
Best ResponseYou've already chosen the best response.0I second ash's answer, it seems correct.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0@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
 4 years ago
Best ResponseYou've already chosen the best response.0I messed it .. I didn't see that there were restrictions on number of letters (I assumed they were 26) ...

Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.0do the first two letters have to be different?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0btw ash's answer assumes that the first two letter is different.

lalaly
 4 years ago
Best ResponseYou've already chosen the best response.3can we make two assumptions? does it mean it has two answers?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Good 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
 4 years ago
Best ResponseYou've already chosen the best response.3Thankyou guys you are all awesome !!!!!!
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