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RailwaysMathHCF AND LCMMedium

If the LCM of the first 110 natural numbers is N, then find the LCM of the first 115 natural numbers. / यदि प्रथम 110 प्राकृतिक संख्याओं का LCM, N है, तो प्रथम 115 प्राकृतिक संख्याओं का LCM ज्ञात कीजिए।

We only need to check the additional numbers 111, 112, 113, 114 and 115. Here, 111 = 3 × 37, 112 = 2⁴ × 7, 114 = 2 × 3 × 19 and 115 = 5 × 23. All…
RailwaysMathHCF AND LCMMedium

Three runners complete a round in 40, 60 and 80 seconds respectively. If they start together, after how much time will they meet at the starting point again? / तीन धावक एक चक्कर क्रमशः 40, 60 और 80 सेकंड में पूरा करते हैं। यदि वे एक साथ शुरू करते हैं, तो प्रारंभिक बिंदु पर पुनः कितने समय बाद मिलेंगे?