Maths - LCM and HCF

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6. Sum of all factors of 248 is

A
320.
B
480.
C
560.
D
400.

Answer
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Option : B
Explanation :

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7. Sum of the factors 48 will be

A
124.
B
130.
C
132.
D
136.

Answer
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Option : A
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8. The LCM of 12, 15, 18 and 20 would be

A
175.
B
160.
C
180.
D
220.

Answer
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Option : C
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9. The LCM of 24, 48, 96 and 60 would be

A
440.
B
480.
C
465.
D
484.

Answer
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Option : B
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10. Find the LCM of 2 x 3 x 5 x 7 and 3 x 5 x 7 x 11.

A
2 x 3 x 5 x 7 x 11.
B
2 x 32 x 32 x 72 x 11.
C
3 x 5 x 7.
D
None of the above.

Answer
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Option : A
Explanation : Required LCM = 2 x 3 x 5 x 7 x 11. 11 :. LCM of 20, 24,30 and 32 = 2 x 2 x 2 x 2 x 2 x 3 x 5 = 480.

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