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If 3 is the least prime factor of number a and 7 is the least prime factor of number b, then the least
prime factor of a + b, is
  • a)
    2
  • b)
    3
  • c)
    5
  • d)
    10
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If 3 is the least prime factor of number a and 7 is the least prime fa...
The prime factors of a + b
= 3 + 7 = 10 = 2 × 5
So the least prime factor is 2.
Free Test
Community Answer
If 3 is the least prime factor of number a and 7 is the least prime fa...
It can not be figured out as to what are the real values of n and k are, and only 2 can be observed as a factor there. Thus, the least prime factor of (a+b) will be clearly 2. Hence a + b is even (i.e a multiple of 2). Thus the least prime factor of 'a + b' is 2.
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If 3 is the least prime factor of number a and 7 is the least prime factor of number b, then the leastprime factor of a + b, isa)2b)3c)5d)10Correct answer is option 'A'. Can you explain this answer?
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