21.How many numbers are there between 100 and 1000 so that every digit in the number is either 2 or 5?
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22.How many 3-digit numbers can be formed without using the digits 1, 5, 6, 9 when repetition of digits is (i) allowed (ii) not allowed?
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23.How many numbers are there between 100 and 1000 such that 3 is at the unit place when repetition of digits is allowed?
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24.A man wants to select a shirt and a trouser from a shop. If there are 25 shirts and 40 trousers in varieties. In how many ways can he choose one shirt and one trouser?
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25.In a set of 8 true or false questions, no student has written all correct answers and no two students have given the same sequence of answers. What is the maximum number of students in the class, for this to be possible?
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26.A team consists of 8 boys and 3 girls and other has 6 boys and 4 girls. How many single matches can be arranged between two teams, when a boy plays against a boy and a girl plays against a girl?
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27.Each section in class XI of school has exactly 35 students. If there are 4 sections, in how many ways can a student representative be selected from each section?
Short Answer Type
