a and b are two positive integers such that the least prime factor of a is 3 and the least prime factor of b is 5. then the least prime factor of (a+b) is what?
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2 is the least prime factor of all even numbers
∴ number 'a' can not be a even number
⇒ 'a' is multiple of 5
∴5 is the least factor of a+b.
∴ number 'a' can not be a even number
⇒ 'a' is multiple of 5
∴5 is the least factor of a+b.
Angelp:
but it's ans will be 2
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