Answer:
(1/10)^18 - (1/10)^20
= 1/(10^18) - 1/(10^20)
= (10^2 - 1)/(10^20)
= 99/(10^20)
= 1/(10^18) - 1/(10^20)
= (10^2 - 1)/(10^20)
= 99/(10^20)
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