Question

If a number is divisible by 3 and 7 must be divisible 21​

Answer 1

Answer:

No

we can't say that if any no. is divisible by 3 and 7 then it's divisible by 21

Step-by-step explanation:

but if a no. is divisible by 21 then we can say that the no. is divisible by 3 and 7

Answer 2

Answer:

yes , it must be divided by 21

e.g: 42

42 /3=14 and 42/7=6 and 42/21=2