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2-30.
  1. Brian has the following sums to find: Homework Help ✎


    • 1 + 3
      1 + 3 + 5
      1 + 3 + 5 + 7
      ·
      ·
      ·
      1 + 3 + 5 + … + 101

    Find a shortcut so that he will not have to add the last sum by hand.

1 + 3 = 4 or 22 (How many terms are in the sum?)

1 + 3 + 5 = 9 or 32 (How many terms are in the sum?)

1 + 3 + 5 + 7 = 16 or 42 (How many terms are in the sum?)

(How many terms are in the final sum?)