Question
Which of the following trophic levels (in the pyramid of
number) has maximum number of individuals?Solution
The correct answer is B
How many 4-digit numbers can be formed using digits 1–9 if repetition is not allowed and the number is even?
In a group of 9 boys and 5 girls, 5 students have to be selected. In how many ways it can be done so that only 2 boys are included.
In how ways can the selection be made so that a particular member is always included?
In how many ways can a cube be coloured using 5 distinct colours, if one colour is used on two opposite faces and each of the remaining colours has to ...
In how many ways can the letters of the word ‘EDUCATION’ be arranged such that the vowels take the odd positions?
In how many different ways can the letters of the word ‘NATURE’ be arranged in such a way that the vowels occupy only the odd positions?
Find total number of ways in which the word “BOOKKEEPER” can be arranged.
How many 5-digit numbers can be formed using digits 1–7 such that digits are odd-even-odd-even-odd?
7 children are to be selected from a group of 8 boys and 6 girls. In how many ways will the children with at most 3 girls and at least 4 boys be selected?
In how many different ways can the letters of the word 'COMPUTER' be arranged in such a way that the vowels always come together?
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