Free Practice Question
PS · Problem Solving
sub-505
Divisibility/Multiples/Factors
What is the sum of the different positive prime factors of 780?
Answer Choices
Correct answer marked belowA
5
B
10
C
15
D
17
23
Correct
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Explanation
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Official Explanation
Official
To find the prime factorization of 780, we start by breaking it down: 780 = 78 * 10 = 6 * 13 * 10 = 2 * 3 * 2 * 5 * 13 = 2^2 * 3 * 5 *…
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Comments
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S
ShivangiJul 8, 2024
thankss
A
AkhilApr 24, 2025
Thanks
What this question tests
What it tests
Your understanding of divisibility rules, least common multiples, and greatest common factors.
Common trap
Forgetting that 1 is not prime and that every integer divides 0.
Details
Difficulty
sub-505
Type
PS
Category