Reply
Fri 8 Apr, 2005 07:42 am
There are several ways to use all the digits from 1 to 9 in equations equaling 468. Reversal of top and bottom is not allowed.
How many ways can you find?
That depends on what operations are permitted.
Here's one that's probably legal:
9*8*7-(6*5)-4-3+2-1
No that isnt allowed it has to be
whatever = 468 so the numbers 468 are already used and the only numbers left to use for the other side of the equation are 123579.
Get it? Like 173 + 295 = 468 or 295 + = 468 but this would count as one since you reversed them like he said isn't counted as two then just one.
Oh! Well, your example gives:
173+295, 175+293, 193+275, 195+273
And there's:
371+92+5, 371+95+2, 372+91+5, 372+95+1, 375+91+2, 375+92+1
391+72+5, 391+75+2, 392+71+5, 392+75+1, 395+71+2, 395+72+1
And:
531-72+9, 539-72+1
But I happen to LIKE . . . the reversal of top and bottom.
<Moping>