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Question

Find the value of \(\sqrt{388 + \sqrt{127 + \sqrt{289}}}\).

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is

20

Step 1 – Innermost root: \(\sqrt{289} = 17\)

Step 2 – Middle root: \(\sqrt{127 + 17} = \sqrt{144} = 12\)

Step 3 – Outermost root: \(\sqrt{388 + 12} = \sqrt{400} = \mathbf{20}\)

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Important Questions from Surds and Indices

  1. The value of \(\frac{{{{\left( {251} \right)}^3} + {{\left( {249} \right)}^3}}}{{25.1 \times 25.1 - 624.99 + 24.9 \times 24.9}}\)  is 5 × 10 , where the value of k is :

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