Calculate the sum of odd numbers between 1 and 2001

pokvarilaap 2022-10-09 Answered
Calculate the sum of odd numbers between 1 and 2001
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Answers (1)

Frida King
Answered 2022-10-10 Author has 8 answers
How many odd numbers are between 1 and 2001?
They form a sequence which general formula is
a n = a + ( n - 1 ) d 1999 = 3 + ( n - 1 ) 2 n = 999
Their sum is
S = n 2 ( a 1 + a n ) = 999 2 ( 3 + 1999 ) S = 999999
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