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Smog is a type of air pollution; the word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid 20th century. This kind of smog is caused by the burning of large amounts of coal within a city; this smog contains soot particulates from smoke, sulfur dioxide and other components.
How many different words can be formed with the letters of the word PRACTICE such that each of the word begin with E and ends with R?
In how many ways 6 novels and 7 notebooks can be arranged in a row so that they are alternate?
How many 6-digit numbers can be formed from the digits 0,3,4,5,6 and 8, in which the digits are not repeated?
How many unique arrangements can be made using all the letters of the word "DELUSION", ensuring that the vowels do not appear together?
A team of 4 men and 2 women is to be selected out of 8 men and 4 women. If only one man and one woman remain in the team, then what will be the total nu...
How many words can be formed from the word INCREASE in which both E’s do not come together?
Find the no. of words formed by using all the letter of the word DISCOUNT, so that the vowels are never together?
In how many different ways can the letters of the word ‘CURIOES’ be arranged in such a way that the vowels occupy only the odd positions?
A box contains 2 blue, 3 black and 5 orange balls. In how many ways can 3 balls be drawn from the box, if at least 1 black ball is to be included in the...
In how ways can the selection be made so that a particular member is always included?