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QUANT 4-PACK SERIES Problem Solving Pack 3 Question 1 What is the positive difference...What is the positive difference between the sum of the squares of the first 4 positive integers and the sum of the prime numbers between the first square and fourth square?
A) 11
B) 12
C) 13
D) 14
E) 15
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This question is part of the Quant 4-Pack seriesScroll Down For Official Explanation Hi All,
Certain Quant questions on Test Day are just about doing organized work and making sure that you're following the 'instructions' in the prompt.
Here, we're asked to compare two sums:
1) The sum of the squares of the first 4 positive integers
2) The sum of the prime numbers between the first square and fourth square
For the first sum, we need the SQUARES of the first four positive integers. That sum is....
\(1^{2}\) + \(2^{2}\) + \(3^{2}\)+ \(4^{2}\) = 1 + 4 + 9 + 16 = 30
For the second sum, we need the PRIMES between 1 and 16. That sum is...
2 + 3 + 5 + 7 + 11 + 13 = 41
The positive difference between those sums is 41 - 30 = 11
Final Answer:
GMAT assassins aren't born, they're made,
Rich