Question

if least prime factor oi a number m is 3 and least prime factor of another number n is 7, then least prime factor of the number (M+n ) (A) 2 (B) 3 (C) 5 (D) 7​

Answer 1

Answer:

⇒a=3(2n−1). ⇒a=6n−3 ---(1). So, a=6n−3 is the general form of the number that has least prime factor '3'.

Answer 2

Step-by-step explanation:

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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