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Answer:
Step-by-step explanation:
A cardinal number is the number of distinct elements in a finite set.
Your set consists the integers from 208 to 1007.
Each element is 1 more than the preceding element, so it represents an arithmetic sequence with distinct elements.
The formula for the nth term in an arithmetic sequence is
aₙ = a₁ + (n - 1)d, where
a₁ = the first element of the sequence
n = the common difference between successive terms
In your sequence,
a₁ = 208 and d = 1
To figure out how many elements are in the set, set aₙ to 1007 — the last member — and solve for n.