Question

who can explain this.......pls do t spam....correct answer will get 25 thnx..as well as branlist.

dint say that its not clear....​

Answer 1

It's divisibility rule of 7.

In this you have to subtract two times the unit digit number from the remaining number and if the number obtained after subtracting is divisible by 7 then the original number will be divisible by 7.

For example:-

343

Unit digit=3

So 34-2×3

=34-6

=28

And 28 is divisible by 7 so 343 will also be divisible by 7.

Hope you understand it.

Answer 2

Explanation:

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It's divisibility rule of 7.

In this you have to subtract two times the unit digit number from the remaining number and if the number obtained after subtracting is divisible by 7 then the original number will be divisible by 7.

For example:-

343

Unit digit=3

So 34-2×3

=34-6

=28

And 28 is divisible by 7 so 343 will also be divisible by 7.