Question

In each of the following numbers, replace M by the smallest whole number to make the resulting number divisible by 3:
(i) $64M3$

Answer 1

Step: Find the value of M
Given number: /(64 M 3\)
A number is divisible by $3$ if the sum of its digit is divisible by $3$ or multiple of $3$.
Here, the sum of digits =$6$+$4$+$M$+$3$
=$13$+$M$
The number which is divisible by $3$ next to $13$ is $15$.
So, the required number =$15$−$13$ =$2$
Hence, the value of $M$ is $2$.