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The HCF and LCM of two numbers m and n a...

The HCF and LCM of two numbers `m` and `n` are respectively 6 and 210. If `m+n = 72` , then `1/m + 1/n ` is equal to

A

`1/35`

B

`3/35`

C

`5/37`

D

`2/35`

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Verified by Experts

The correct Answer is:
D
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ARIHANT PUBLICATION PUNJAB-LCM AND HCF-CHAPTER EXERCISE
  1. The least number which when divided by 4,6,8,12 and 16 leaves a remain...

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  2. The largest number, which divides 25, 73 and 97 to leave the same r...

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  3. The HCF and LCM of two numbers m and n are respectively 6 and 210. If ...

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  4. The LCM of two numbers is 20 times of their HCF and (LCM + HCF) = 2520...

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  5. What is the least number of square tiles required to pave the floor of...

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  6. Three sets of English, Mathematics and Science books containing 336,...

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  7. A farmer has 945 cows and 2475 sheep. He farms them into flock keeping...

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  8. A milk vendor has 21 lt of cow milk, 42 lt of toned milk and 63 lt of ...

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  9. In a school, all the students can stand in a row, so that each row has...

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  10. Five bells begin to toll together at intervals of 9s,6s,4s,10s and 8s,...

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  11. A General can draw up his soldiers in the rows of 10, 15 or 18 soldier...

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  12. The least number which is a perfect square and is also divisible by 10...

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  13. Sum of HCF and LCM of 4,20 and 28 is

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  14. HCF of two numbers is 28 and their LCM is 336. if one number is 112, t...

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  15. We call a number perfect if it is the sum of all its positive divisors...

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  16. The LCM of two prime numbers x and y, (x gt y) is 161 . The value ...

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  17. If a = 3^(129) xx 5^128 xx 7^22 b = 3^128 xx 5^129 xx 7^21 c = 3^1...

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  18. Calculate no. of factors of 100.

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  19. The sum of all the factors of 50 is

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  20. The number of factors of 84 is

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