Question

119 2 -111 2 is : (A) Prime number (B) Composite number (C) An odd prime number (D) An odd composite number

Answer 1

Solution:

119² - 111²

= (119+111)(119-111)

/* a²-b² = (a+b)(a-b) */

= 230×8

= 230×8×1

[ more than two factors ]

{ Composite numbers }

/* A number which has more than two factors is called composite number */

Therefore,

Option (B) is correct.

••••

Answer 2

Answer:

option (B) is correct

Step-by-step explanation:

I have found the answer without calculating the value of the given expression.

Concept used:

Square of any odd number is odd.

$119^2-111^2$

=(an odd number) - (another odd number)

= an even number

=2k(say)

Then, it is divisible by 2

Option (B) is correct