Question

What's this supposed to mean

We shall say that an n-digit number is pandigital if it makes use of all the digits 1 to n exactly once; for example, the 5-digit number, 15234, is 1 through 5 pandigital.

The product 7254 is unusual, as the identity, 39x186 = 7254, containing multiplicand, multiplier, and product is 1 through 9 pandigital.

Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.

HINT: Some products can be obtained in more than one way so be sure to only include it once in your sum.

Answer 1

the list seems to be
12 483 5796

18 297 5346

42 138 5796

27 198 5346

28 157 4396

39 186 7254

48 159 7632

2 1793 3586

2 4178 8356

2 4358 8716

2 3459 6918

2 3479 6958

2 4659 9318

2 4569 9138

2 4769 9538

2 4679 9358

3 1942 5826

3 2615 7845

3 1625 4875

3 2915 8745

3 2618 7854

3 2918 8754

3 1928 5784

3 1594 4782

4 1732 6928

4 1593 6372

4 1963 7852

4 1738 6952

4 1958 7832

4 2379 9516

6 1432 8592

6 1572 9432

6 1573 9438

7 1235 8645

7 1364 9548

Answer 2

the sum of unique product seems to be
247882

Answer 3

am i missing something?

Answer 4

well there are no examples where multiplier is 8 or 9

Answer 5

I tried all ... couldn't find one.

Answer 6

What's this supposed to mean
"Find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigita"

Answer 7

was the list already provided?

Answer 8

I think it means to add 5796+5346+5796+...

Answer 9

And I dont think all the listed numbers are correct

Answer 10

the list was not provided. I wrote a program to compute the list.

Answer 11

i added up unique values
5796+5346+5796+... = 247882

Answer 12

http://projecteuler.net/problem=32

Answer 13

if the list was already provided, then all you need to you to need first find those number whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigita. For example 12*483=5796 is a 1 through 9 pandigita (because you can find all digit 1 to 9 in that).
But another entry in the list 2*1793=3586 is not a 1 through 9 pandigita (there is no 4). So filter out the 1 through 9 pandigita first. And then sum them up.

Answer 14

oh i see. but the list isn't correct. there are entries which can't be called a 1 through 9 pandigita - i think!

Answer 15

*pandigital

looks like it i didn't check it manually.

Answer 16

looks like in need to edit my program.

Answer 17

oh right! "pandigital"...i copied the word! =)

Answer 18

yes, you do!

Answer 19

this looks final

12 483 5796

18 297 5346

42 138 5796

27 198 5346

28 157 4396

39 186 7254

48 159 7632

4 1963 7852

4 1738 6952

--------------------------

sum =

45228

Answer 20

Bingo!!
help each other's with medals!!

Answer 21

lol! finally!! yeah, that seems right!

Answer 22

@experimentX u use which programming language to write progrmas

Answer 23

nowdays i'm using matlab + mathematica ... I'm planning to learn python. besides that i know bunch of other languges.

Answer 24

better learn python ... it's serves multipurpose.

Answer 25

Oh ya......... I have seen my friends writting program using python.... That looks good.

Answer 26

once you learn one language ... rest of language have similar structure.

Answer 27

Well i know as u know Q-basic that we learn at school...... and can also use Visual Basic....... But python looks very different.

Answer 28

once you get your hands on it ... probably programming python is lot faster than those in Basic or VB

Answer 29

Well thanx I will try it.