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- jacks
- 2012-12-24 02:06:37
Thanks friends got it
- phrontister
- 2012-12-22 21:53:52
Hi,
a = 2...from d x 4 = even, and a x 4 must be a single-digit result (to avoid a 5-digit end product).
b = 1...from b x 4 must be a single-digit result (to keep a = 2), and 2 is already taken.
d = 8...from a x 4 = 8.
c = 7...from (c x 4) + the tens unit (3) from d x 4 must end in 1, which is only possible with c = 7 or 2; but 2 is already taken.
So, abcd is 2178.
- bobbym
- 2012-12-22 06:20:41
Hi;
First thing that jumps right out at you is that the front digit is either a 1 or 2. So, the last digit is a 4 or an 8. You now only have to try 16 numbers to find all the answers.
- jacks
- 2012-12-22 06:11:18
Yes 2178 is right answer.
How can i get it.
would you like to explain me
hanks
- bobbym
- 2012-12-22 05:48:18
Hi;
Yes, and that is the only solution.
- anonimnystefy
- 2012-12-22 05:33:17
I have that abcd=2178.
- jacks
- 2012-12-22 05:15:13
A 4 digit no. abcd is such that 4 *(abcd) = (dcba). Then no. abcd is