I am new to adsense can you please answer following:

1. How many no of websites can I use with a pub id
2. Can I change the color of ad according to my web page
3. Can I change the size of ad whatever I want


Thanks,
Raina
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1. unlimited.
2. yes.
3. yes.

For 2 you already have a Adsense setup to be doing all for you.
For 3 you have some standard formats to choose from.

Thanks shabbir and ppro!!