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- lalaly

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- katieb

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- lalaly

##### 1 Attachment

- anonymous

a) 6435

- lalaly

ok what abt (b) 2)

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- anonymous

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

- lalaly

:D:D

- anonymous

b) 1) 792

- lalaly

do u know how to do the rest? i mean c

- anonymous

okk c1) would be (26C2 - 26) * (899) * 26
C2) would be 9/899

- 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

don't you have answers??

- lalaly

unfortunately no

- anonymous

What does between 100 and 899 means? Interval is closed or open?

- ash2326

how is 100 to 999- 899 no.s
it's 900 no.s

- anonymous

ohh i didnt see the restriction on letters ..
but the concept remains the same .. :)

- 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

I second ash's answer, it seems correct.

- 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

I messed it .. I didn't see that there were restrictions on number of letters (I assumed they were 26) ...

- anonymous

ah fine then :)

- Zarkon

do the first two letters have to be different?

- anonymous

btw ash's answer assumes that the first two letter is different.

- Zarkon

that is why i asked

- lalaly

can we make two assumptions? does it mean it has two answers?

- 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

Thankyou guys you are all awesome !!!!!!

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