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In a football championship, 153 matches were played . Every two teams played one match with each other. The number of teams, participating in the championship is ______.

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Three balls are drawn from a bag containing 5 red, 4 white and 3 black balls. The number of ways in which this can be done if at least 2 are red is ______.

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The number of six-digit numbers, all digits of which are odd is ______.

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The total number of ways in which six ‘+’ and four ‘–’ signs can be arranged in a line such that no two signs ‘–’ occur together is ______.

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A committee of 6 is to be chosen from 10 men and 7 women so as to contain atleast 3 men and 2 women. In how many different ways can this be done if two particular women refuse to serve on the same committee.

[Hint: At least 3 men and 2 women: The number of ways = ¹⁰C₃ × ⁷C₃ + ¹⁰C₄ × ⁷C₂.

For 2 particular women to be always there: the number of ways = ¹⁰C₄ + ¹⁰C₃ × ⁵C₁.

The total number of committees when two particular women are never together = Total – together.]