Mathematics · Probability
From the first 100 natural numbers, two numbers, first a and then b, are selected randomly without replacement. If the probability that a - b ≤ -10 or a - b ≥ 10 is mn where gcd(m, n) = 1, then m + n is equal to:
- 1173
- 2191
- 3181✓
- 4163
Correct answer
181
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