How do you find the sum of alternate numbers?

If N is an even number then the sum of alternate sign of first N natural numbers are = (-N) / 2. If N is an odd number then the sum of alternate sign of first N natural numbers are = (N + 1) / 2.

How do you find alternate numbers in Python?

“how to print alternate numbers in python” Code Answer

1. list = [1,2,3,4,5]
2. alternate_list = list[::2]
3. #as we are looking for even indices only, and 2 is the smallest even number.
4. #so, using list[::2] slices every second item of the list.
5. for item in alternate_list:
6. print(item)
7. #Hope this helps:)

How do you find the sum of numbers from 1 to N?

The formula of the sum of first n natural numbers is S=n(n+1)2 . If the sum of first n natural number is 325 then find n.

How do you find the sum of alternate numbers in a list in Python?

Use the percentage operator to separate the numbers at Even and Odd positions. And then add the elements to the respective position of a new empty list. Finally giving a list which shows sum of elements at odd position and sum of elements at even position.

What is alternate number?

Alternate numbers are the numbers in which all digits alternate between even and odd. Numbers are very alternating when double the number is an alternating number as well. For example; 3816 is very alternating, because 7632 is an alternating number as well.

What is the sum of N odd numbers?

Sum of n odd numbers = n2 where n is a natural number. To calculate the sum of first n odd numbers together without actually adding them individually.

How do I print alternate letters in python?

For printing odd characters, we need to start with characters starting at position 1 with a difference of 2. Slicing operator in this case will be written as str[1::2] . index is initialized to 0. A while loop iterates over the string starting from 0 till the length of string which is calculated using len function.

How do you print two lists alternately in Python?

“python merge two lists alternating” Code Answer

1. a = [1, 3, 5]
2. b = [2, 4, 6]
3. c = []
4. for x, y in zip(a, b):
5. c += [x, y]
6. ​
7. print(c)
8. # [1, 2, 3, 4, 5, 6]

How do you print alternate strings in Python?

What is alternating sum in math?

An alternating sum is a series of real numbers in which the terms alternate sign. For instance, the divisibility rule for 11 is to take the alternating sum of the digits of the integer in question and check if the result is divisble by 11. …

How to sum alternate numbers from 1 to 11 in Python?

You can make of list of alternate numbers from 1 to 11. Using sum function you can find sum of elements in list, which are alternate numbers from 1 to 11. In Python 2.x, range function returns a list. Whereas in Python 3.x, range function returns an range object ( a type of iterable ).

How to find sum of elements in a list in Python?

Using sum function you can find sum of elements in list, which are alternate numbers from 1 to 11. In Python 2.x, range function returns a list. Whereas in Python 3.x, range function returns an range object ( a type of iterable ).

How to calculate sum of odd numbers from 1 to N in Python?

Write a Python Program to Calculate Sum of Odd Numbers from 1 to N using While Loop, and For Loop with an example. This Python program allows the user to enter the maximum value. Next, Python is going to calculate the sum of odd numbers from 1 to user-entered maximum value.

How to test the program for a different number in Python?

Note: To test the program for a different number, change the value of num. Initially, the sum is initialized to 0. And, the number is stored in variable num. Then, we used the while loop to iterate until num becomes zero. In each iteration of the loop, we have added the num to sum and the value of num is decreased by 1.