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Number System (HCF & LCM - 8) (in Hindi)
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Number System (HCF & LCM - 8) (in Hindi)

Bharat Gupta is teaching live on Unacademy Plus

Bharat Gupta
Engineer by degree Mathematician by Heart. Having 22 years of teaching experience. More than 20000 students selected.

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An alternate solution to the last question: numbers are 6533, 4031. Both are odd (so b,d not possible), now both are not divisible by 3 so a not possible hence answer is c.