- Write a program that prompts the user to enter a number and then prints the sum of all odd numbers from 1 to that number. -- The program should use a function to read the number and a function to ...

Given an array of integers arr, return the number of sub-arrays with an odd sum. A sub-array is a contiguous part of the array. The solution uses a prefix sum approach to efficiently count the number ...

If you feel a little odd today, your calendar might explain why. Today’s date, 9/11/13, is a mathematical phenomenon so rare that it only occurs five times every 100 years. This is the last time for ...

There is a long, beautiful history of thinking about numbers and shapes as two aspects of the same idea. Square numbers are often described using arithmetic: 1 = 1 x 1 = 1, 2 = 2 x 2 = 4, 3 = 3 x 3 = ...

A mathematical proof is a sequence of statements that follow on logically from each other that shows that something is always true. Using letters to stand for numbers means that we can make statements ...

A mathematical proof is a sequence of statements that follow on logically from each other that shows that something is always true. Using letters to stand for numbers means that we can make statements ...