In binary series terms are in the binary form. So to solve the binary series problem first we need to convert into decimal form.

After converting into decimal form you easily recognise the pattern of the series.

Follow the below example to have a better knowledge about binary series.

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```Example. 11_{2},101_{2},111_{2},1001_{2}____

A) 1000_{2}

B) 1011_{2}

C)1111_{2}

D) 1001_{2}

**Answer:**B) 1011_{2}

**Explanation:**Here,the term are in binary form.So convert into decimal form we get 3,5,7,9 i.e consecutive odd numbers.So the next term is 11.By converting into binary form we get 1011.