Hi,

I have the following problem and I don't know how to go about this... I would really appreciate if you could give me a hand. The problem says:

"Let . Show that

,

where is the sum of digits of (in decimal representation of r)."

- Apr 8th 2011, 04:06 PMjmgilbertShow that Z=E mod 9, where E is the sum of digits of r (in dec. repres. of r)
Hi,

I have the following problem and I don't know how to go about this... I would really appreciate if you could give me a hand. The problem says:

"Let . Show that

,

where is the sum of digits of (in decimal representation of r)." - Apr 8th 2011, 04:33 PMtonio