Question
72, 81, 99, ?, 162,
207 What will come in place of the question mark (?) in the following series?Solution
ATQ, The series follows the pattern, 72 + 9 × 1 = 81, 81 + 9 × 2 = 99, 99 + 9 × 3 = 126, 126 + 9 × 4 = 162, 162 + 9 × 5 = 207.
The condition for the line y = mx + c to be tangent to the circle x ² + y ² = r ² is
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? = (597.98 ÷ (6.97 2.01 – 3.1)) × 12.9
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