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How many words can be formed using the letters of the word 'CORRESPONDENCE' if the consonants are always written together?

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Important Questions on X+2 Maths

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If six persons are selected out of ten, in how many ways will a particular person be found among those six?
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A committee of five has to be chosen among six men and four ladies. In how many ways can this be done in order to include at least one lady?
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How many ways are there to pick two different cards from a deck of 52 cards such that the first card is an ace and the second is not a queen?
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How many different license plates involving three letters and three digits are there if the three letters appear together, either at the beginning or at the end of the license?
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A joint committee of students and teachers of 5 members has to be formed with 4 teachers, 3 male students, and 5 female students. How many different committees can be formed if the committee must consist of at least 2 teachers, 1 male student, and 2 female students?
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There are 8 different locks, with exactly one key for each lock. All the keys have been mixed up. What is the maximum number of trials required in order to determine which key belongs to which lock?
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Hoppers' Stop stocks four styles of trousers. For each style, there are ten different possible waist sizes, six different trousers lengths and four colour choices. How many different types of trousers could the store have?
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In a group of boys, the number of arrangements of 4 boys is 12 times the number of arrangements of 2 boys. The number of boys in the group is: