RPF Constable practice question
A time period consists of 84 complete years, followed by the months of January, February of a non-leap (ordinary) year, followed by 25 extra days. Find the total number of odd days in this entire period.
From a RPF Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 0 odd days
Step 1 (Years): For 84 years, using the century rule (100→5, 200→3, 300→1, 400→0 odd days, cycle repeats) combined with the leap-year count for the remainder, the total odd days from years = 0.
Step 2 (Months): Since the months fall in a non-leap (ordinary) year, month lengths are January=31, February=28 days, summing to 59 days.
Step 3 (Extra days): 25 extra days are added directly.
Total = 0 + 59 + 25 = 84.
Odd days = 84 mod 7 = 0.
हिंदी में प्रश्न
एक समयावधि में 84 पूर्ण वर्ष, उसके बाद किसी सामान्य (गैर-लीप) वर्ष के जनवरी, फरवरी महीने, तथा उसके बाद 25 अतिरिक्त दिन शामिल हैं। इस पूरी अवधि में कुल विषम दिनों की संख्या ज्ञात कीजिए।
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सही उत्तर: (C) 0 विषम दिन
चरण 1 (वर्ष): 84 वर्षों के लिए, शताब्दी नियम (100→5, 200→3, 300→1, 400→0 विषम दिन, यह क्रम दोहराता है) तथा शेष वर्षों के लीप वर्ष की गणना को मिलाकर, वर्षों से कुल विषम दिन = 0 प्राप्त होते हैं।
चरण 2 (महीने): चूँकि ये महीने एक सामान्य (गैर-लीप) वर्ष में आते हैं, महीनों के दिन जनवरी=31, फरवरी=28 हैं, जिनका योग 59 दिन है।
चरण 3 (अतिरिक्त दिन): 25 अतिरिक्त दिन सीधे जोड़े जाते हैं।
कुल = 0 + 59 + 25 = 84।
विषम दिन = 84 mod 7 = 0।
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