Find the sum of the series till 23rd terms for the series: 1, 4, 5, 8, 9, 12, 13, 16, 17, .....

Find the sum of the series till 23rd terms for the series: 1, 4, 5, 8, 9, 12, 13, 16, 17, ..... 

• A. 585
• B. 560
• C. 540
• D. 520

 

The correct answer is option C. 540. Can you explain this answer in the comments?

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