Maths · Arithmetic and Geometric progressions
What is the sum of 12 odd numbers
What is the sum of 12 odd numbers \( \mathbf{1}, \mathbf{3}, \mathbf{5}, \mathbf{7}, \mathbf{9} \ldots . . ? \)
- A. 12
- B. 144
- C. 141 \)
- D. 124
Step-by-step solution
The odd numbers form an arithmetic progression with first term 1 and common difference 2. The sum of the first n odd numbers is n². For n=12, sum = 12² = 144.
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