Can RC gear and XBee use 2.4Ghz both?

I've read the APM manual
"If you have 2.4Ghz RC gear, you should use 900Mhz Xbee modules."
Is that mean one's frequency will interfere another when both in 2.4?

but I send an e-mail to my teacher
he says that 2.4Ghz RC gear can hop frequency to avoid int

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What I need to buy for FPV?

Hellow all!    this is my first post here!

Im a novice from Taiwan.
I cant find any info about APM in taiwan.
so I come here ......but my english is not pretty good
maybe I've found what I want but I missed it.......
hope anyone can answer my little quest

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