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Find the sum of all even integers from 25 to 427.

 Jan 22, 2021
 #1
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The first even integer  is  26

The last is   426

 

The number of  terms =    (426 - 26)  / 2   +  1  =     200  +  1  = 201

 

The sum is

 

[ 26  + 426  ] (201/2)   =  

 

[ 452 ] / 2  * 201 =

 

45426

 

 

cool cool cool

 Jan 22, 2021

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