Determine 82975

Determine the sum of all positive odd numbers less than 78

Correct answer:

s =  1521

Step-by-step explanation:

s=1 +3 + 5 +  + 75 + 77  d=2 a=1 b=77  b = a + (n1) d  n=dba+1=2771+1=39  s=2a+b n=21+77 39=1521



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