(Q). In a class of 12 students 7 are boy & rest are girls. In how many ways students can be selected for the project such that at least 1 boy & 1 girl is selected.Solution:-Nuber of ways of selecting one or more boys is (2⁷ – 1) = 127 waysNumber of ways...
(Q). A class has 10 students 7 are boys and 3 are girls. In how many ways students can be selected for a project.Solution:-Every student (either boy or girl) has 2 ways of selection → either selected or rejected.∴ students can be selected in 2⁷×2³ = 2¹⁰ = 1024...
(Q). How many factors of 1800 other than 1800 are 4 digit number?Solution:-1800 = 2³×3²×5²So except 1800 itself other largest factor is = = 900 → three digitsHence number of four digit factors = 0 ...
(Q). In an exam a question paper has 10 questions. What is the total number of ways that a student can answer this paper?Solution:-Each question has two ways to answer it either answered or unanswered∴ total number of ways to attempt question paper = 2¹⁰ = 1024...
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