just like a friend says,哪儿 is used more frequently in north and less in south,because in south people don't say "儿化音“ . the "儿化音” is kinda like "Lily"~"Lill" ,and it usually used in casual occasion a spoken language.
hope this can help
2 ตุลาคม 2014
2
1
1
哪兒 is more nort east. (ex, beijing)
哪裡 is use more in south.
1 ตุลาคม 2014
1
1
1
“哪儿” is more spoken,especially for people who live in Nord, (cuz southern don't always use “儿化音”(←do u know it?