यदि a = 4011 और b = 3989 है तब ab का मान ज्ञात कीजिए।

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  1. 15999879
  2. 15899879
  3. 15989979
  4. 15998879

Answer (Detailed Solution Below)

Option 1 : 15999879
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प्रयुक्त सूत्र:

(a + b) × (a - b) = a2 - b2

गणना:

माना कि 

a = 4000 + 11

b = 4000 - 11

⇒ a × b = (4000 + 11) × (4000 - 11)

⇒ 16000000 - 121

⇒ 15999879

∴ विकल्प 1 सही चयन है।

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