Question

What is the trick to find the 3 digit numbers divided by. 7?

Answer 1

The Three digit number divisble by 7 :--

100 to 999 are total three digit numbers

so 100/3 == remaining 5 add to 100 it will become 105,,,

and now 999/5 == remaining 5 subtract from 999...

Now.

AP becomes 105, 112, 119 ......... 995.
Common difference is 7
First term is 105


Now you have to find last term..

$a + (n - 1)d$

$105 + (n - 1)7 = 995$
$896 \div 7 = (n - 1) \\ 128 = (n - 1) \\ n = 129$
Here is your answer mark me brainliest if you like it !!!