RRB Group D (Level-1 posts) 2022 · Question 443 of 598
64 : 81 :: 121 : 144 : 169 : ? Step-by-Step Analysis 1. 64 and 81 64 = 82 81 = 92 The relationship: The second number (81) is the square of the next integer after the square root of the first number (64). That is, √64 + 1 = 9, and 92 = 81. 2. 121 and 144 121 = 112 144 = 122 The relationship: The second number (144) is the square of the next integer after the square root of the first number (121). That is, √121 + 1 = 12, and 122 = 144. 3. 169 and ? 169 = 132 Following the same pattern, the next integer after the square root of 169 is 14, and 142 = 196. Final Answer The missing number is 196.
Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 3) - Prepp · reliable-secondary
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