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Question

The cube root of 250 lies between:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
6 and 7

Estimating the Cube Root of 250

To find the interval where the cube root of 250 lies, we need to find two consecutive integers whose cubes bracket the number 250.

We can test the cubes of integers:

  • Calculate the cube of 5: $5^3 = 5 \times 5 \times 5 = 125$
  • Calculate the cube of 6: $6^3 = 6 \times 6 \times 6 = 216$
  • Calculate the cube of 7: $7^3 = 7 \times 7 \times 7 = 343$

Determining the Interval

We observe that 250 is greater than $6^3$ (which is 216) and less than $7^3$ (which is 343).

Mathematically, this can be represented as:

$ 6^3 < 250 < 7^3 $

Taking the cube root of all parts of the inequality:

$ \sqrt[3]{6^3} < \sqrt[3]{250} < \sqrt[3]{7^3} $ $ 6 < \sqrt[3]{250} < 7 $

Therefore, the cube root of 250 lies between the integers 6 and 7.

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Important Questions from Cube and Cube Root

  1. If 5 \(\sqrt{3}\) + \(\sqrt{75}\) = 17.32, then the value of 14 \(\sqrt{3}\) \(\sqrt{108}\) is:

  2. Find the value of (25)3 + (-29)3 + (4)3

  3. The value of \(\frac{\sqrt[3]{-2744} \times \sqrt[3]{-216}}{\sqrt[3]{\frac{64}{729}}}\) is:

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