Perms and Combs Problem

[Shrinidhi]

Q]Ajay is attempting a test which contains 150 multiple choice
questions with each question having four choices.In how many ways can
he solve the test if he should get at least two right answers? any
question that is unattempted is treated as wrong.
Sorry guyz no options for this question.

[suv]

4^150 - 151

[suv]

srry 5^150 - 601

> > Sorry guyz no options for this question.- Hide quoted text -
>
> - Show quoted text -

[Rohan Aggarwal]

750- 151 ?

--
You received this message because you are subscribed to the Google
Groups "Simple fundas" group.
To post to this group, send email to simple...@googlegroups.com
To unsubscribe from this group, send email to
simple-funda...@googlegroups.com
For more options, visit this group at
http://groups.google.co.in/group/simple-fundas?hl=en-GB

Regards,
Suvrit Chadha

[Rohan Aggarwal]

no its 750-601

[suv]

srry.. again wrng :P

On Aug 9, 12:01 pm, Rohan Aggarwal <jiit.ro...@gmail.com> wrote:
> no its 750-601
>

> On Mon, Aug 9, 2010 at 12:29 PM, Rohan Aggarwal <jiit.ro...@gmail.com>wrote:
>
>
>
> > 750- 151 ?
>
> > On Mon, Aug 9, 2010 at 12:22 PM, suv <suv...@gmail.com> wrote:
>
> >> srry 5^150 - 601
>
> >> On Aug 9, 11:22 am, suv <suv...@gmail.com> wrote:
> >> > 4^150 - 151
>
> >> > On Aug 9, 6:36 am, Shrinidhi <coolshrinid...@gmail.com> wrote:
>
> >> > > Q]Ajay is attempting a test  which contains 150 multiple choice
> >> > > questions with each question having four choices.In how many ways can
> >> > > he solve the test if he should get at least two right answers? any
> >> > > question  that is unattempted is treated as wrong.
> >> > > Sorry guyz no options for this question.- Hide quoted text -
>
> >> > - Show quoted text -
>
> >> --
> >> You received this message because you are subscribed to the Google
> >> Groups "Simple fundas" group.
> >> To post to this group, send email to simple...@googlegroups.com
> >> To unsubscribe from this group, send email to

> >> simple-funda...@googlegroups.com<simple-fundas%2Bunsubscribe@goog­legroups.com>

> >> For more options, visit this group at
> >>http://groups.google.co.in/group/simple-fundas?hl=en-GB
>
> >> Regards,

> >> Suvrit Chadha- Hide quoted text -

[suv]

5^150-150(4^149)-4^150
(last attmpt :P)

> > - Show quoted text -- Hide quoted text -

[Rohan Aggarwal]

5^150 - 4^149 -1 :D phewww!

[shrinidhi k]

@Rohan even i got the same answer but it wasn't there in the options.
@suv how did u get 601 whats your logic??

>> > >> simple-funda...@googlegroups.com<simple-fundas%2Bunsu...@googlegroups.com>

>> <simple-fundas%2Bunsubscribe@goog­legroups.com>
>> > >> For more options, visit this group at
>> > >>http://groups.google.co.in/group/simple-fundas?hl=en-GB
>> >
>> > >> Regards,
>> > >> Suvrit Chadha- Hide quoted text -
>> >
>> > - Show quoted text -
>>
>> --
>> You received this message because you are subscribed to the Google
>> Groups "Simple fundas" group.
>> To post to this group, send email to simple...@googlegroups.com
>> To unsubscribe from this group, send email to

>> simple-funda...@googlegroups.com<simple-fundas%2Bunsu...@googlegroups.com>

[Rohan Aggarwal]

wel suv and i reached this ans.. 5^150 - 150*4^149 - 4^150

5^150  -  total ways of solving paper

150*4^149 -> 150 for choosing which ques to be done right and 4^149 for having combinations of wrng ans.

4^150 - for having no right answer there are 4 ways of doing a ques wrng.

this is definately the ans... plz tel wats the correct ans ?

[Rohan Aggarwal]

simplified ans -  5^150 -146*4^149

[shrinidhi k]

The question appeared in the mocks, even i got the same answer but the
question didnt have the above answer in the options.i dont remember
the optins clearly they had some options like 5^150-601
4^150-160
5^150-160
4^150-601

>> <simple-fundas%2Bunsu...@googlegroups.com<simple-fundas%252Buns...@googlegroups.com>

>> >
>> >> <simple-fundas%2Bunsubscribe@goog­legroups.com>
>> >> > >> For more options, visit this group at
>> >> > >>http://groups.google.co.in/group/simple-fundas?hl=en-GB
>> >> >
>> >> > >> Regards,
>> >> > >> Suvrit Chadha- Hide quoted text -
>> >> >
>> >> > - Show quoted text -
>> >>
>> >> --
>> >> You received this message because you are subscribed to the Google
>> >> Groups "Simple fundas" group.
>> >> To post to this group, send email to simple...@googlegroups.com
>> >> To unsubscribe from this group, send email to
>> >> simple-funda...@googlegroups.com<simple-fundas%2Bunsu...@googlegroups.com>

>> <simple-fundas%2Bunsu...@googlegroups.com<simple-fundas%252Buns...@googlegroups.com>

[Rohan Aggarwal]

ohh :(