Arithmetic progressions.

Find the sum of all the numbers between 9 and 204, which is exactly divisible by 3.

Correct answer:

s =  7029

Step-by-step explanation:

a=9/3=3 b=204/3=68  n=ba+1=683+1=66  s1=2a+b n=23+68 66=2343  s=3 s1=3 2343=7029



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