Hello,

The equation to be used while solving this type of series is (n x 3) + 2. where n is the previous digit.

For example,  in the above series we have to find the digit after 53, so by using this formula (n x 3) + 2 we get (53 x 3) + 2 = 161.

so the series will be 1,5,17,53,161.

Similarly if you find the next digits you can use the equation. The next digit will be (161 x 3) + 2 = 485.

So the series is 1,5,17,53,161,485 and so on....

Hope this was helpful

Hello Aspirant

In this series the previous number is multiple by 3 and then 2 is added to for the next number

1 multiplied by 3 is 3 and add two becomes 5

5 multiplied by 3 is 15 and add2 becomes 17

17 times 3 is 51 and add 2 and it becomes 53

therefore 53 times 3 is 159 and add 2 it becomes 161