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2-30.

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?)