Use of comma in a sentence with multiple clauses

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Hi,

I want to understand usage of comma in sentences with multiple clauses/phrases. I googled and found explanations, but not sure if they are accepted on GMAT?

1. We're still happy, although we have no money.
or
We're still happy although we have no money.

2. Mary has a car, a motorbike, and a bicycle.
or
Mary has a car, a motorbike and a bicycle.

Regards,
Vaibhav

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by transfer9858 » Mon Sep 10, 2012 5:45 pm
1. I would say the first one. We are still happy- full clause, although we have no money cannot be by itself so it has to be attached by a comma.


2. I don't think either of those are correct. I thin it should be " mary has a car, motorbike and bicycle.