Tick (✓) the correct answer:

Question:

Tick (✓) the correct answer:

(197 × 203) = ?

(a) 39991

(b) 39999

(c) 40009

(d) 40001

Solution:

(a) 39991

$(197) \times(203)$      [using the identity (a+b) (a-b) = a2  -b2]

$\Rightarrow(200-3)(200+3)$

$\Rightarrow(200)^{2}-(3)^{2}$

$\Rightarrow 40000-9$

$\Rightarrow 39991$

 

Leave a comment

Close
faculty

Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now