Ask Question
27 January, 09:33

What is the sum of n natural numbers: 1+2 + ... + n?

+5
Answers (1)
  1. 27 January, 11:13
    0
    S = 1/2 n (n+1)

    Step-by-step explanation:

    1 + 2 + 3 + ... + n

    Now write in reverse order:

    n + n-1 + n-2 + ... + 1

    Add together:

    n+1 + n+1 + n+1 + ... + n+1

    n (n+1)

    Since this is double the sum:

    S = 1/2 n (n+1)
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “What is the sum of n natural numbers: 1+2 + ... + n? ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers