An urn contains ten blue balls numbered 1 through 10 and ten red balls also numbered 1 through 10. Five balls are extracted without replacement from the urn. How many combinations (order irrelevant) will contain only odd numbered balls? Five balls are extracted with replacement from the urn. How many combinations (order irrelevant) will contain only odd numbered balls? Five balls are extracted without replacement. How many combinations (order irrelevant) consist of at least 3 red balls?

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