Answer: The correct way to write the given number is

Explanation :
Scientific notation is defined as the method of representing a number which is very large or very small in the form of decimals. In this notation, the number is always written in the power of 10.
For example: 35000 is written as
of 0.00035 is written as
In the question, we are given a value of 1,550,000,000.
The scientific notation for the given numerical value will be

Hence, the correct way to write the given number is
