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SESSION February/MARCH 2024
course CODE & NAME DCA1103 – Basic Mathematics





  1. By using truth tables, check whether the propositions  and  are logically equivalent or not?


To determine if the propositions  ¬ ( ∧ ) ¬(p∧q) and  ¬ ∨ ¬ ¬p∨¬q are logically equivalent, we can construct truth tables for both propositions and compare their truth values for all possible truth values of  p and  q.

Step-by-Step Construction of Truth Tables

List all possible

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  1. Find the nth term of the sequence and find its limit if exist.

Ans: To find the  n-th term of the sequence  3 , 2 , 5 3 , 6 4 , 7 5 , … 3,2,  3 5 ​  ,  4 6 ​  ,  5 7 ​  ,…, we need to look for a pattern in the sequence. 

Let’s denote the   n-th term of the sequence by   a  n ​  .



  1. Apply Cramer’s rule to solve the system of equations: ; 2; .

Sol:-  To solve the system of equations using Cramer’s rule, we need to follow these steps:  Write down the system of equations in matrix form: 

{ 3 + + 2 = 3 2 − 3 = − 3 + 2 + = 4
3x+y+2z=3 2x−3y−z=−3 x+2y+z=4}











  1. One card is drawn from a well shuffled deck of 52 cards. If each outcome is equally likely, calculate the probability that the card will be

(i) a diamond                                      (ii) not a black card

(iii) a black card (i.e., a club or, a spade) (iv) not a diamond.


To calculate the probabilities of drawing specific types of cards from a well-shuffled deck of 52 cards, we’ll use basic probability principles. Each outcome (drawing a specific card) is equally likely, so the probability of drawing a specific type of card can be found by dividing the number of favourable outcomes by the total number of possible outcomes.


Total Number of


  1. In an office there are 84 employees. Their salaries are as given below:
Salary (Rs.) 2430 2590 2870 3390 4720 5160
Employees 4 28 31 16 3 2
  1. i) Find the mean salary of the employees
  2. ii) What is the total salary of the employees?


To find the mean salary of the employees and the total salary of the employees, we can follow these steps:


  1. i) Find the Mean Salary


The mean salary can be found using the formula for the weighted mean, which is given by:



\text{Mean} = \frac{\sum (x_i \cdot f_i)}{\sum f_i}




– \( x_i \) is the salary.

– \( f_i \) is the number of employees receiving that salary.

– \(\sum (x_i \cdot f_i)\) is the


  1. Consider 77, 73, 75, 70, 72, 76, 75, 72, 74, 76. Give standard deviation for the numbers given above.


To find the standard deviation of the given numbers, we need to follow these steps:  Calculate the mean (average) of the numbers. Calculate the variance, which is the average of the squared differences from the mean. Take the square root of the variance to get the standard deviation.

Step 1: Calculate the Mean First, sum up all the numbers and then divide by the count of numbers. 

Mean = ∑ = 1

Mean=  n ∑  i=1 n