My son and I are trying to figure it out. We are feeling stumped. Help!
2006-06-08 09:38:40 · 7 answers · asked by claracuente05 2 in Science & Mathematics ➔ Mathematics
think about a two-digit number [ab]=10*a+b (thus the two digits are a and b), then [ab]-(a+b)=(10a+b)-(a+b)=9a. Therefore your choice only depends on the first digit a.
they put the symbol at every 9 places, so for every a from 1 to 9, there is a symbol at 9a.
You will notice that the same symbol is at 9, 18, 27, 36, 45, 54, 63, 72, and 81 (the possibilities for [ab]-(a+b))
2006-06-08 09:44:09 · answer #1 · answered by Eulercrosser 4 · 2⤊ 0⤋
Whatever number you choose.. after the mathematics asked for... you'll always be left with a multiples of 9....
now what they do is that everytime you do it... they have different symbol for 9.. all the multiples of 9 have the same symbol as 9....
so they just need to show that symbol..
2006-06-08 09:54:12 · answer #2 · answered by Varun G 3 · 1⤊ 0⤋
I believe that Eulercrosser is correct. He should be chosen as best answer.
2006-06-08 11:06:05 · answer #3 · answered by quickster94 3 · 0⤊ 2⤋
I was wondering much the same question
2016-08-22 23:29:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
This is bugging me as well
2016-07-26 06:01:46 · answer #5 · answered by Winifred 4 · 0⤊ 0⤋
makes no sense to me
2006-06-08 09:43:23 · answer #6 · answered by MrTayL 2 · 0⤊ 2⤋
Thanks for the link.
2006-06-08 09:45:52 · answer #7 · answered by ag_iitkgp 7 · 0⤊ 2⤋