11. A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag? |
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12. In how many ways can three consonants and two vowels be selected from the letters of the word "TRIANGLE"? |
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13. In a class there are 20 boys and 25 girls. In how many ways can a boy and a girl be selected? |
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14. A question paper consists of five problems, each problem having three internal choices. In how many ways can a candidate attempt one or more problems? |
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15. In how many ways can a committee consisting of three men and four women be formed from a group of six men and seven women? |
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16. A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most -. |
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17. How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)? |
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18. How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9} |
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19. In how many ways can six members be selected from a group of ten members? |
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20. In a group of six boys and four girls, 4 children are to be selected. In how many different ways can they be selected such that at least one boy should be there? |
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Those are all planning for any competitive examinations can use this segment to enhance their abilities.