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Concepts
Primes & Factors: Level 3 1. The sum of three distinct prime numbers is 40. What is the largest possible product of these three primes? 199 286 434 550 646 Check Solution (E): The sum is 40 (even). To get an even sum from three primes, one of them must be 2. So, \(2 +…
Primes & Factors: Level 2 1. What is the sum of all prime numbers between 20 and 40? 81 110 117 120 143 Check Solution (D): The prime numbers between 20 and 40 are: 23, 29, 31, 37. Their sum is \(23 + 29 + 31 + 37 = 120\). 2. If \(p\) and \(q\)…
GRE Primes & Factors: Level 1 1. What is the sum of the first five prime numbers? 18 26 28 30 39 Check Solution (C): The first five prime numbers are 2, 3, 5, 7, and 11. Their sum is \(2 + 3 + 5 + 7 + 11 = 28\). 2. If \(p\) is…
Topic 5: LCM, HCF, Factors, Multiples & Divisibility Tests Understanding factors, multiples, and divisibility rules forms the foundation of arithmetic and number theory. Mastery of these concepts will help you quickly solve problems related to fractions, algebra, and data sufficiency in competitive exams like GMAT, GRE, and SAT. Divisibility Rules Here are the quick tests…