Discrete Mathematics Questions and Answers – Number Theory – Least Common Multiples

This set of Discrete Mathematics Multiple Choice Questions & Answers (MCQs) focuses on “Number Theory – Least Common Multiples”.

1. A Least Common Multiple of a, b is defined as __________
a) It is the smallest integer divisible by both a and b
b) It is the greatest integer divisible by both a and b
c) It is the sum of the number a and b
d) None of the mentioned
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2. The LCM of two number 1, b(integer) are _________
a) b + 2
b) 1
c) b
d) None of the mentioned
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3. If a, b are integers such that a > b then lcm(a, b) lies in _________
a) a>lcm(a, b)>b
b) a>b>lcm(a, b)
c) lcm(a, b)>=a>b
d) none of the mentioned
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4. LCM of 6, 10 is?
a) 60
b) 30
c) 10
d) 6
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5. The product of two numbers are 12 and their Greatest common divisor is 2 then LCM is?
a) 12
b) 2
c) 6
d) None of the mentioned
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6. If LCM of two number is 14 and GCD is 1 then the product of two numbers is?
a) 14
b) 15
c) 7
d) 49
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7. If a number is 2² x 3¹ x 5⁰ and b is 2¹ x 3¹ x 5¹ then lcm of a, b is?
a) 2² x 3¹ x 5¹
b) 2² x 3² x 5²
c) 2³ x 3¹ x 5⁰
d) 2² x 3² x 5⁰
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8. State whether the given statement is True or False.
LCM (a, b, c, d) = LCM(a,(LCM(b,(LCM(c, d)))).
a) True
b) False
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9. LCM(a, b) is equals to _________
a) ab/(GCD(a, b))
b) (a+b)/(GCD(a, b))
c) (GCD(a, b))/ab
d) none of the mentioned
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10. The lcm of two prime numbers a and b is _________
a) ^a⁄_b
b) ab
c) a + b
d) 1
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Sanfoundry Global Education & Learning Series – Discrete Mathematics.

To practice all areas of Discrete Mathematics, here is complete set of 1000+ Multiple Choice Questions and Answers.