Number System
What value should come in place of ? in the given number series ? 15, 51, 162, 498, 1509, ?

4545
5656
3434
7878

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Number System
The sum of the ages of a son and father is 65 years. After 5 years the age of father will be double of the age of son. What is the age of son ?

20 years
19 years
17 years
18 years

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