What is the least value of 'a' for which the number 638a435 is completely divisible by 3?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 1.
Divisibility of 3: If the sum of the digits of a number is divisible by 3 then, the number is divisible by 3.
According to the given question,
The sum of the digits of the given number = (6 + 3 + 8 + a + 4 + 3 + 5) = 29 + a
The lowest value of a which makes the number divisible by 3 is 1
⇒ 29 + 1 = 30 which is divisible by 3
Hence, the required answer is 1.