In how many different ways (without regard to order) can I choose 2 positive integers less than 50 that differ by more than 2 ?
A.
990
B.
1035
C.
1081
D.
1128
Exam No：2022 First Round Grade 7 Year：2022 Question No：23
Answer:
C
Knowledge points:
G7 - Combinatorics - Basic Combinatorics (Listing & Casework)
Solution:
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