Mathematics · Progression
A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = .... = a10 = 150 and a10, a11, a12, ...... are in an A.P. with a common difference of −2, then the total time taken by him to count all the notes is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1135 minutes
- 2125 minutes
- 334 minutes✓
- 424 minutes
Correct answer
34 minutes
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