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The sigma notation for the sum is a standard notation in mathematics used to concisely express sums with a great number of terms. See your textbook for more information. Associate the equivalent expressions: -t of(xi) -vin 1. 80 +51 + 12 + 3 + . . + In 2. f (In ) + f ( x 1 ) + f ( x2 ) + ... + f (in) 3. f (= ) + f (12 ) + ... + f (In) 4. n.f (x] )