**The Thread has been closed.**

Puys Please continue here..

**Official Quant Thread for CAT 2011**

http://www.pagalguy.com/discussions/official-quant-thread-for-cat-2011-part-4-25070678/2874214

the number 916238457 is an example of a nine-digit number which contains each of the digits 1 to 9 exactly once. It also has the property that the digits 1 to 5 occur in their natural order, while the digits 1 to 6 do not. How many such numbers are there?

Off for some vocab

9c5*4!

sry.. from this we have to subtract cases where 12345 and 6 are in the accending order....

This thread is now Officially closed...koi band kar do bhai

This thread is now Officially closed...koi band kar do bhai

1 comes before 2

2 before 3 and co on

6 out of series haii

no. of ways of selecting 5 places in 9 places = 9C5

in this in the number of cases in which 6 is right to 5 has to be subtracted...

if 5 in 5th place 4 case

if 5 in 6th place 5C4*3 cases

if 5 in 7th 6C4*2

if 5 in 8th 7C4...

9C5= 126

126- (4+ 15 + 30 + 35) = 42... i think sum mistake myt hav crept in please let me know..

from arun sharma:-

what is the remainder when (1!)^3+(2!)^3+(3!)^3+..............+(1152!)^3 is divided by 1152?

Q.Tap A fills water in a tank in 8 hrs, tap B fills the same tank with milk in 10 hrs. A man who wanted to fill the tank with water and milk ,starts tap A

in a tank containing milk up to 5% of tank capacity initially.After 4 hrs ,he starts tap B till the tank gets filled completely. In what proportion should he mix this solution with the other one containing water and milk in the ratio 1:3?

a)1:1

b)1:2

c)2:1

d)1:3 (correct option)

take capacity of 80ltrs

efficiency of tap A(water)=10ltrs/hr

efficiency of tap B(milk)=8ltrs/hr

5% of 80=4(milk containing tank)

In 1st 4hrs tap A threw 40ltrs of water,36 short to fill the tank completely

In next 2hrs tank will get completely filled

now,total milk in tank=4+8+8=20

water=60

ration=water:milk=3:1

after this dont understand what the question is??

pandit jii Saysbhaii sab log humara swaal kyun nazar andaaz kar dete haii :splat::splat::splat:

Hi,

My take to your question is

5,7,8,9 should come after 1,2,3,4,6.

So, arrange all the numbers i.e. 9! and divide it by the numbers at the right.

Answer is 9!/4!

Is it correct, puys?

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