1.

(x+7)³-(x-7)³ इस सवाल मे =a³+b³+3ab(a+b) formula लगेगा।​

Answer»

No
इसमें [A3 - b3 = a3 - b3 - 3a2b + 3ab2] वाली प्रॉपर्टी लगेगी
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