Calculate the sum of odd numbers between 1 and 2001

pokvarilaap

pokvarilaap

Answered question

2022-10-09

Calculate the sum of odd numbers between 1 and 2001

Answer & Explanation

Frida King

Frida King

Beginner2022-10-10Added 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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