Question
115, 138, 163, 190, 219,
? Find the missing number in the following number series:Solution
The series follows the pattern: 115+23 = 138 138 +25 = 163 163+27 = 190 190 +29 = 219 219+31 = 250
If sinθ = 3/5 and θ is an acute angle, find cos θ.
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121, 129, 139, 151, 165, 181
