3. Dante is making a necklace with 18 rows of tiny beads in which the number of beads per row is given by the series 3+ 9 + 15 + 21 + ... a. If you were to write this series in summation notation, give i. the lower limit of the sum ii. the upper limit of the sum iii. the explicit formula of the series b. Find the total number of beads in the necklace. Explain your method for finding the total number of beads.

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