(Q). A question paper is divided into two parts A & B and each part contains 5 questions. The number of ways in which a candidate can answer 6 questions selecting at least two questions from each part...
(Q). A box contains two white balls, three black balls and four red balls. In how many ways can three balls be drawn from the box if at least one black ball is to be included in the draw.Solution:-Since here in question it is not mentioned that ball are identical so...
(Q). Let E = {1, 2, 3, 4} and F = {1, 2} then the number of onto functions from E to F will be?Solution:-In set E every element has 2 option to match with set F either 1 or 2.Hence total number of functions from E to F is 2⁴ = 16out of these 16 functions we find that...
(Q). There are infinite number of letters F, L and Y. In how many ways we can choose ‘n’ letters such that the word ‘FLY’ can not be formed?Solution:-The word ‘FLY’ can not be formed if the ‘n’ selected letters do not...
(Q). If ‘p’ is the number of ways in which three numbers in A.P. can be selected from 1, 2, 3, 4, …….., n. Then find the value of p if(i). n is odd(ii). n is evenSolution:-Given numbers are :-1, 2, 3, 4, ………., nLet the three...
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