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1.The sum of three prime numbers is 220. One of them exceeds another by 60. Which of the following is one of the prime numbers?
2.The sum of three distinct prime numbers is 46. What is the largest possible prime number?
3.The number of prime numbers lying between 334 and 347, both numbers inclusive, is _______.3509
4.Let p and q be distinct positive prime numbers such that p > q and p2 − q2 = 45. What is the value of p + q?
5.Let a, b, α and β be prime numbers. n is the number of ordered pairs of a and b where 2< a < b < 50 and b- a=2. Also, α and β are the least and the greatest prime numbers less than 50. What is the value of n(α+β)?
6.Which of the given pairs is not a co-prime pair?6906
7.Which of the following pairs of numbers is co-prime?
8.Which of the following pairs of numbers are co-prime?
9.What is the average of prime numbers lying between 5 and 30?
10.The least common multiple of two numbers is 21 times the first number, and the highest common factor of the two numbers is a two-digit prime number. What is the least possible value of the second number?