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Multiple Choice Questions

Rohan started practicing maths from 3rd June He could solve only 3 problems on the first day However...........

Math and Mental Ability Time and work

Rohan started practicing maths from 3rd June. He could solve only 3 problems on the first day. However, he increased his speed such that he solved 6 problems on the second day, 9 on the third, and so on. If he continued this trend throughout June, how many problems did he solve on 25th June of the same year?

None of these

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Explanation:

- Rohan started on 3rd June, solving 3 problems on the first day.
- Each day he increases the number of problems by 3 (3, 6, 9,...).
- This pattern forms an arithmetic sequence: \(a_n = 3n\), where \(n\) is the day since he started.
- By 25th June, he would have practiced for 23 days since 3rd June.
- Using the sequence \(a_n = 3n\), on the 23rd day, he solves \(3 \times 23 = 69\) problems.
- **None of the given options (57, 66, 63) are correct.**

So, the correct answer is option:4- None of these.

✅ **Your answer is right**

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