893 = ____

ক (90-1)2
খ (90-1)3
গ 12
ঘ 92

সঠিক উত্তর: (90-1)3

If we must find the cube of the 89, we use the second variation i.e.(90-1)3. This would help us and make the calculations easier instead of multiplying the number with itself thrice. Therefore (90-1)3 = 903 – 3 × 902 × 1 + 3 × 90 × 12 – 13 Therefore (90-1)3 = 729000 – 24300 + 270 – 1 Therefore (90-1)3 = 704969.
Bissoy MCQ
#Class 8 Maths #Cubes and Cube Roots

Related Questions

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