Question : Directions: Select the option that can replace the question mark (?) in the second row. Row 1: 5, 6, 2, 4, 81 Row 2: 1, 3, 2, 4, ? Row 3: 2, 3, 1, 5, 39
Option 1: 30
Option 2: 52
Option 3: 40
Option 4: 73
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Correct Answer: 30
Solution : Given: Row 1: 5, 6, 2, 4, 81 Row 2: 1, 3, 2, 4, ? Row 3: 2, 3, 1, 5, 39
The sum of the square of the first four numbers equals the fifth number – In row 1: 5 2 + 6 2 + 2 2 + 4 2 = 25 + 36 + 4 + 16 = 81 In row 3: 2 2 + 3 2 + 1 2 + 5 2 = 4 + 9 + 1 + 25 = 39 Similarly, follow the same pattern in row 2: 1 2 + 3 2 + 2 2 + 4 2 = 1 + 9 + 4 + 16 = 30
So, the required missing number is 30. Hence, the first option is correct.
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