Question

Sum of all odd number from 1to 999 which are not divisible by 3

Answer 1

Step-by-step explanation:

3 +9 +15 + ... + 999 =

999 =3 +(n-1)6

999 =6n -3

6n =1002

n=167

S =n/2(a1 +a167)

=167/2(3 +999)

=167(1002)/2

=83667

Answer 2

Answer:

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