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Balloon Recalculation going ON! (Page 231)

jaysp Goldie
jaysp
jaysp

Joined: 13 September 2005
Posts: 1928

Posted: 30 March 2006 at 1:26pm | IP Logged
Math qs. are definitely better then the IF qs. Wish they had removed all IF qs.

princess belle IF-Dazzler
princess belle
princess belle

Joined: 14 December 2005
Posts: 2582

Posted: 30 March 2006 at 1:27pm | IP Logged
hey kruti the mathmatecian help me with the pyramid question plsWink
jaysp Goldie
jaysp
jaysp

Joined: 13 September 2005
Posts: 1928

Posted: 30 March 2006 at 1:28pm | IP Logged
I gtg. Bye guys. Catch you all later. Good night to all in India. Go get some sleep.
Kruts IF-Dazzler
Kruts
Kruts

Joined: 10 August 2005
Posts: 2602

Posted: 30 March 2006 at 1:29pm | IP Logged
two four digit palindromes that sum up to a five digit palindrome (it has to have 1 as first and last digits for this to even work):
a b b a
c d d c
-------
1 e f e 1

now a+c has to be less than 20 but greater than 10 to obtain a 1 at the end.

Thus a+c=11.

There are a total of eight possibilities but out of these, 4 are duplicates because we have not defined a and c yet...Thus the 4 possibilities are:
a 2 3 4 5
c 9 8 7 6

Let us take a=2 and c=9 for example:
Now we have 2 b b 2 and 9 d d 9 as our numbers.

Thus e is either equal to 1 or equal to 2 based on if we need to carry over a digit or not (11 -> 10 + 1).
If e=1 => b+d has no carry over digit => b+d=0
If e=2 => b+d has carry over digit...similar logic as earlier, b+d=11 is the only possibility.

Now, we know that b+d=0 or b+d=11:
If b+d=0...only once choice for b and d (both equal to zero individually) --> 4x1 = 4 possibilities.
If b+d=11...8 ways to choose b and d and 4 choices for a&c ==> 4x8 =32.

Therefore total possibilities = 4+32=36!!
Kruts IF-Dazzler
Kruts
Kruts

Joined: 10 August 2005
Posts: 2602

Posted: 30 March 2006 at 1:30pm | IP Logged
hey kruti the mathmatecian help me with the pyramid question pls

which pyramid question???
Kruts IF-Dazzler
Kruts
Kruts

Joined: 10 August 2005
Posts: 2602

Posted: 30 March 2006 at 1:31pm | IP Logged
o no! I have to meet my advisor in 30 mins and i need to go to school for that...leave your questions in this thread...i will try to reply them this evening or sthg.
*dolly* IF-Sizzlerz
*dolly*
*dolly*

Joined: 22 January 2005
Posts: 13663

Posted: 30 March 2006 at 1:34pm | IP Logged
ok kruti
go hurry up
will leave my q
thanks
Kruts IF-Dazzler
Kruts
Kruts

Joined: 10 August 2005
Posts: 2602

Posted: 30 March 2006 at 1:34pm | IP Logged
o never mind the appt just cancelled

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