Question

Q1) Write a Python program to calculate the sum of series : 1^2+2^2 + 3^2 +.........+ n^2

Q2)Display Fibonacci series for 0 1 1 2 3 5 ...... n (in Python programming language)

Q3)Write a python program to find the factorial of a given number.​

Answer 1

Explanation:

###########      1     ###############

# Python Program to calculate Sum of Series 1²+2²+3²+….+n²

 

number = int(input("Please Enter any Positive Number  : "))

total = 0

total = (number * (number + 1) * (2 * number + 1)) / 6

for i in range(1, number + 1):

   if(i != number):

       print("%d^2 + " %i, end = ' ')

   else:

       print("{0}^2 = {1}".format(i, total))

########### 2 ###########

# Program to display the Fibonacci sequence up to n-th term

nterms = int(input("How many terms? "))

# first two terms

n1, n2 = 0, 1

count = 0

# check if the number of terms is valid

if nterms <= 0:

  print("Please enter a positive integer")

elif nterms == 1:

  print("Fibonacci sequence upto",nterms,":")

  print(n1)

else:

  print("Fibonacci sequence:")

  while count < nterms:

      print(n1)

      nth = n1 + n2

      # update values

      n1 = n2

      n2 = nth

      count += 1

############# 3 ##############

# Python 3 program to find    

# factorial of given number  

def factorial(n):  

   if n < 0:  

       return 0

   elif n == 0 or n == 1:  

       return 1

   else:  

       fact = 1

       while(n > 1):  

           fact *= n  

           n -= 1

       return fact  

 

# Driver Code  

num = 5;  

print("Factorial of",num,"is",  

factorial(num))