Permutations and Combinations questions
785 published questions with worked solutions.
- The sum of all odd proper divisors of 360 is
- 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...
- From a group of persons the number of ways of selecting 5 persons is equal to that of 8 persons. The number of persons in the...
- The total number of 9-digit numbers of different digits is
- The number of 6-digit numbers that can be made with the digits 0, 1, 2, 3, 4 and 5 so that even digits occupy odd places, is
- Seven different lecturers are to deliver lectures in seven periods of a class on a particular day. A, B and C are three of the...
- The total number of 5-digit numbers of different digits in which the digit in the middle is the largest is
- The total number of ways in which six '+' and four '−' signs can be arranged in a line such that no two '−' signs occur together...
- The total number of words that can be made by writing the letters of the word PARAMETER so that no vowel is between two...
- Let S be the set of all functions from the set A to the set A. If n(A) = k then n(S) is
- Let A be the set of 4-digit numbers a_1a_2a_3a_4 where a_1 > a_2 > a_3 > a_4 then n(A) is equal to
- The number of numbers divisible by 3 that can be formed by four different even digits is
- The number of 5-digit even numbers that can be made with the digits 0, 1, 2 and 3 is
- The number of 4-digit numbers that can be made with the digits 1, 2, 3, 4 and 5 in which at least two digits are identical, is
- The number of words that can be made by rearranging the letters of the word APURBA so that vowels and consonants alternate is
- The number of numbers of 9 different nonzero digits such that all the digits in the first four places are less than the digit in...
- In the decimal system of numeration the number of 6-digit numbers in which the digit in any place is greater than the digit to...
- The number of 5-digit numbers in which no two consecutive digits are identical is
- The sum of all the numbers of four different digits that can be made by using the digits 0, 1, 2 and 3 is
- A teacher takes 3 children from her class to the zoo at a time as often as she can, but she does not take the same three children...
Other chapters
Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration