Question

Evaluate {(999)'2-1}​

Answer 1

1000 is a correct answer

Answer 2

Answer:

Given : {(999)

2

−1}

The given question can be written as

{(999)

2

−1

2

}

Using the formula (a

2

−b

2

)=(a+b)(a−b)

{(999)

2

−1

2

}=[(999+1)(999−1)]

On further calculation,

{(999)

2

−1

2

}=1000×998

{(999)

2

−1

2

}=998000