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We have 4 + 8 = 12 number of events occurring simultaneously.
Where these 12 events represent the digit values.
1st digit has only 9 possible values.
5th digit has only 9 possible values.
The rest of the 10 digits have 10 possible values.
We multiply their individual possible outcomes and get:
(9^2 )*(10^10) = 810,000,000,000
Answer choice C.) 810,000,000,000
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