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Let Us C Solutions:Chapter 1  Exercise    [A] Which of the following are invalid variable names and why?   BASICSALARY  Ans . It is a valid variable .   _basic  Ans . It is a valid variable .  basic-hra  Ans . It is a invalid variable because ‘-’ is used (only alphabet, hyphen and numbers can be used in a variable name).  #MEAN Ans . It is invalid variable name since variable name cannot contain (#).  group.  Ans . It is invalid variable name since variable name cannot contain (.)  422  Ans . It is invalid variable name because variable name cannot Start from number.  Population in 2006  Ans . It is invalid variable name because space cannot be used in a variable name.  over time  Ans . It is invalid   mindovermatter   Ans. It is a valid variable name.  FLOAT  Ans . It is a valid variable name.   hELLO  Ans . It is a valid variable name....

Sets Class 11 Exercise 1.2 Solution  1. Which of the following are examples of the null set (i) Set of odd natural numbers divisible by 2 (ii) Set of even prime numbers (iii) { x : x is a natural numbers, x < 5 and x > 7 } (iv) { y : y is a point common to any two parallel lines} Solution. (I), (iii) and (iv) are null sets 2. Which of the following sets are finite or infinite (i) The set of months of a year Solution. This is a finite set. (ii) {1, 2, 3, . . .} Solution. This is an infinite set. (iii) {1, 2, 3, . . .99, 100} Solution. This is a finite set. (iv) The set of positive integers greater than 100 Solution. This is a finite set. (v) The set of prime numbers less than 99 Solution. This is an infinite set. 3. State whether each of the following set is finite or infinite: (i) The set of lines which are parallel to the x-axis. Solution. This is an infinite set. (ii) The set of letters in the English alphabet. Solution. This is a finite set. (iii) The...

Sets Class 11 Exercise 1.1 Solutions 1. Which of the following are sets ? Justify your answer. (i) The collection of all the months of a year beginning with the letter J.  Solution: It is a set, as here defined elements are collected. (ii) The collection of ten most talented writers of India.   Solution: It is not a set, as we cannot define who is most talented writer. (iii) A team of eleven best-cricket batsmen of the world.    Solution: It is not a set as definition of best batsman is not given. (iv) The collection of all boys in your class.   Solution: It is a set, since we can count the number of boys in your class. (v) The collection of all natural numbers less than 100.   Solution: It is a set as we can write all the natural numbers less than 100. (vi) A collection of novels written by the writer Munshi Prem Chand.  Solution: It is a set because we know which book we have to pick. (vii) The collection of all even integers. Solution: It...