Why do both of my MBP's connect different to my AirPort Extreme?

I have two mid 2010 MacBook Pros. A 13" and a 15" (both support a/b/g/n), both connecting to my AirPort Extreme (latest model). I do not have the 5GHz network enabled on it. The 13" connects to it on channel 149 using a/n while the 15" connects to it using channel 6 using b/g/n. The 13" transmit is much greater than the 15" MBP. Here are my questions:
1) Why is the 15" connecting using b/g/n instead of the a/n like the 13"?
2) How is the 13" connecting to my Extreme on channel 149? Isn't that a 5GHz channel? If it's not enabled then how is this possible?
3) Is there any way to force my 15" to use the a/n instead of b/g/n?

Problem resolved. Please disregard. Thank you.

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