RRB JE practice question
Find the LCM of 28, 35, 60 and 120.
From a RRB JE Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 840
Prime factorise: 28 = 22 × 7; 35 = 5 × 7; 60 = 22 × 3 × 5; 120 = 23 × 3 × 5. LCM takes every prime at its highest power: 23 × 3 × 5 × 7 = 840.
हिंदी में प्रश्न
28, 35, 60 और 120 का ल.स. (LCM) ज्ञात कीजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 840
अभाज्य गुणनखंडन: 28 = 22 × 7; 35 = 5 × 7; 60 = 22 × 3 × 5; 120 = 23 × 3 × 5। ल.स. में प्रत्येक अभाज्य की उच्चतम घात ली जाती है: 23 × 3 × 5 × 7 = 840।
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