Question

Find the sum of all positive integer between 200 and 300 that are divisble by 7

Answer 1

sum of all positive integer is 91

Answer 2

The lowest term is 7 ( 15 ) = 105 .
The highest term is 7 ( 28 ) = 196 .

We need to figure out the number of terms this represents :
You might think it's ( 28 - 15 ) , but it's actually ( 28 - 15 ) + 1 . Convince yourself of this ,

Then the sum is the average of the first and last terms times the number of terms , so :

( 28 - 15 + 1 ) (105 + 196 ) / 2 = 2107 ...

Plz mark as brainliest !! ☺