Question

find value of
(a) 1999 × 2001​

Answer 1

Answer :

To find :

• 1999 × 2001

Solution :

• Identity : (a – b)(a + b) = a² – b²

　 → (2000 – 1)(2000 + 1) = (2000)² – (1)²

　 → 1999 × 2001 = 40,00,000 – 1

　 → 1999 × 2001 = 39,99,999

∴ Required Answer :

• 1999 × 2001 = 39,99,999

Answer 2

Answєr :-

→ 1999 × 2001 = 3,999,999

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