1 + 2 + 3 + s + 50 =

  1. 1300
  2. 1250
  3. 2550
  4. 1275
Answer

D) 1275

Pair the numbers (1 + 50, 2 + 49, …): 25 51 = 1275, i.e. 50 512. SLO M-09-A-10 · Understanding

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