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6 ×1+1 = 7 7 ×2+1= 15 15 ×3+1 = 46 46 ×4+1= 185 185 ×5+1 = 926
An examinee is required to answer 7 questions out of 14 questions, which are divided into two groups each containing 7 questions. He is not permitted to...
A Consignment of 12 mobile phones contains 4 defectives. The mobile phones are selected at random one by one and examined. The ones examined are not pu...
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 ways can 8 women and 8 men be seated around a circular table where no two women can sit together?
How many 8 digit numbers can be formed using the digits 1, 2, 0, 2, 4, 1, 2, 4 ?
Find the number of words that can be formed by using all letters of the word 'ESCAPE', if it starts with letter C and end with letter P.
A person has 12 friends out of which 7 are relatives. In how many ways can he invite 6 friends such that at least 4 of them are relatives?
In how many different ways can the letters of the word 'COMPUTER' be arranged in such a way that the vowels always come together?
In how many different ways can the letter of the word ‘PRAISE’ be arranged?
In how many different ways can the letter of the word ‘STRONG’ be arranged?
