Calculate 8259

Calculate the sum of all 4-digit odd natural numbers.

Correct answer:

s =  24750000

Step-by-step explanation:

a=1001 b=9999 d=2  b=a+(n1)d  n=1+(ba)/d=1+(99991001)/2=4500  s=n 2a+b=4500 21001+9999=24750000



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