Hi Piccolino,
Thanks for pointing that out! This was indeed an error. We have fixed the typo to note that answer choice B has a 60% probability. As you pointed out, this does not change the outcome of the problem. Thanks again. Contact me by email at
tdearr@manhattangre.com and we'd be happy to give you a free MGRE eBook as a reward for your eagle eye.
Best Regards,
Taylor