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A triangular number is a number that is the sum of the integers from 1 to some integer n. Thus 1 is a triangular number because it's the sum of the integers from 1 to 1; 6 is a triangular number because it's 1+2+3=6. Given the non-negative integers m and n (with m < n), create a list of the triangular numbers between (and including) m and n. Thus if m is 3 and n is 20, the list would be: [3, 6, 10, 15]. Associate the list with the variable triangulars.

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Answer:

  1. m = 3
  2. n = 20
  4. triList = []
  5. current = 0
  6. for i in range(1, n + 1):
  7.    current = current + i  
  8.    if(current >= m and current <= n):
  9.        triList.append(current)
  11. print(triList)

Explanation:

The solution code is written in Python 3.

Firstly, create variable m and n and set the value 3 and 20 to the variables (Line 1 -2)

Create a triangle number list (Line 4)  and another variable current to hold the value of current total of triangle number (Line 5).

Create a for loop and iterate through the number between m and n (Line 6).  Calculate the current total of triangle number (Line 7) and proceed to check if the current triangle number is bigger or equal to m and smaller and equal to n, add the current triangle number to triList (Line 8-9).

Print the triList (Line 11) and we shall get [3, 6, 10, 15]

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