RRB Group D previous year question
If a+b+c=14, ab+bc+ca=47 and abc=15, then the value of a³+b³+c³ is:
Asked in RRB Group D CBT-1: 09 Jan 2026 Shift 1 · Quantitative Aptitude
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Correct answer: (B) 815
a³+b³+c³−3abc = (a+b+c)(a²+b²+c²−ab−bc−ca); a²+b²+c² = 14²−2×47 = 102, so a³+b³+c³ = 3×15 + 14×(102−47) = 45+770 = 815.
हिंदी में प्रश्न
यदि a+b+c=14, ab+bc+ca=47 और abc=15 है, तो a³+b³+c³ का मान कितना है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 815
सही उत्तर: विकल्प B (815)
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