Find the remainder when 51439786 is divided by 3. Do that without performing actual division.
We know that if a number is divided by 3, then remainder is remainder obtained by dividing sum of digits by 3.
Here, sum of digits is 43.
∴ 43 ÷ 3 gives remainder 1
Hence, remainder will be 1 when 51439786 is divided by 3.