Question

The product of three consecutive positive integers is divisible by 6'. Is this statement true or false ? Justify your answer.​

Answer 1

Let's check it.

take three consecutive integers as, x-1 , x and x + 1

so, product is

(x-1)(x)(x+1)

= (x^2-1)x

= x^3 - x

Now. Put some values

put, x = 1 1

1^3 - 1 = 0 div. by 6

2^2 - 2 = 6 div. by 6

3^3 - 3 = 6 div by 6

Hence, It is true

Answer 2

Answer:

Step-by-step explanation:

Let three consecutive positive integers be, n, n + 1 and n + 2.  

When a number is divided by 3, the remainder obtained is either 0 or 1 or 2.  

∴ n = 3p or 3p + 1 or 3p + 2, where p is some integer.

If n = 3p, then n is divisible by 3.  

If n = 3p + 1, ⇒ n + 2 = 3p + 1 + 2 = 3p + 3 = 3(p + 1) is divisible by 3.  

If n = 3p + 2, ⇒ n + 1 = 3p + 2 + 1 = 3p + 3 = 3(p + 1) is divisible by 3.  

 

So, we can say that one of the numbers among n, n + 1 and n + 2 is always divisible by 3.  

⇒ n (n + 1) (n + 2) is divisible by 3.  

 

Similarly, when a number is divided 2, the remainder obtained is 0 or 1.  

∴ n = 2q or 2q + 1, where q is some integer.  

If n = 2q ⇒ n and n + 2 = 2q + 2 = 2(q + 1) are divisible by 2.  

If n = 2q + 1 ⇒ n + 1 = 2q + 1 + 1 = 2q + 2 = 2 (q + 1) is divisible by 2.  

 

So, we can say that one of the numbers among n, n + 1 and n + 2 is always divisible by 2.  

⇒ n (n + 1) (n + 2) is divisible by 2.  

 

Hence n (n + 1) (n + 2) is divisible by 2 and 3.

∴ n (n + 1) (n + 2) is divisible by 6.