Question

which of the following number is divisible by both 2 and3 a) 21 b) 15c)20 d) 24​

Answer 1

24 is the number divisible by both 2and 3

Answer 2

Answer:

d) 24

Step-by-step explanation:

Method 1:

Divisibility rule of 2: Every even no. is divisible by 2

Divisibility rule of 3: The sum of digits of the no. must be divisible by 3.

a) 21: Not divisible by 2 as it is not even.

b) 15: Not divisible by 2 as it is not even.

c) 20: Not divisible by 3 as the sum of digits is 2 which is not divisible by 3.

d) 24: Divisible by both 2 and 3 as it is even and sum of digits is 6 which is divisible by 3.

Method 2:

Any no. divisible by both 2 and 3 is also divisibile by 6, here only 24 is divisibile by 6.