Question

Test the divisibility of – a. 100100101 by 3 b. 2571320 by 4​

Answer 1

For divisibility of 3 --- add all number that number divide by 3
For divisibility of 4 --- last 2 digit are divide by 4

a) add all number = 4 is not divisible by 3

b) last two number = 20 it is divisible by 4

Answer 2

Answer:

a number is divisible by 3 if the sum of its digit is divisible by 3 in 100100101 the sum of digits is 1+0+0+1+0+0+1+0+1=4 so 100100101 is not divisible by 3