self Company Numerical Ability Sequence and Series

Q. What it the missing number of the following sequence
1,4,6,?,9

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self Other Question

Q. Complete the above series with proper explanation
1,4,6,....?...9
Q. Please solve it as early as possible A ladder rests against a wall at angle A to the horizontal,if foot is pulled away from the wall through a distance 'a' so that it slides a distance b down the wall making an angle B with the horizontal, show that
a/b = cosA - cosB/SinB - SinA