4 -letter "words" are formed using the letters A, B, C, D, E, F, G. How many such words are possible for each of the following conditions? (a) No condition is imposed. Your answer is : 2401 (b) No letter can be repeated in a word. Your answer is : 840 (c) Each word must begin with the letter A (assume repetition). Your answer is : 343 (d) The letter C must be at the end. Your answer is : 343 (e) The second letter must be a vowel. Your answer is :

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.