# Number Theory MCQs With Answers | Quiz.2

Solved Number theory multiple choice questions with correct answers for university exams. In this MCQs quiz series, you get 200+ MCQs for test preparations. All these MCQs are collected from past papers and important topics of number theory like Greatest Common Divisors(G.C.D), and Least Common Multiple(L.C.M).

## Number Theory MCQs Quiz.2

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Number Theory MCQs Quiz.2

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1. τ(mn)=?

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2. A number-theoretic function is a function whose domain is the set of?

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3. σ(mn)=?

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4. ax + by = c has integer solution if and only if d | c where?

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5. σ(5112)=?

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6. A function F defined on the positive integers is multiplicative if f(m n) =f(m)f(n) whenever?

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7. The Diophantine equation 6x + 15y = 71 has?

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8. τ (64 ) is?

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9. If n is a positive integer, then the number of positive divisors of n is denoted by?

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10. τ(5112)=?

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11. τ(509)=?

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12. 17p + 1 is a square for all primes p =?

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13. 7p + 4 is a perfect square for all primes p =?

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14. If n is a positive integer, then the sum of all the positive divisors of n is denoted by?

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15. If p is prime and p | ab, then?