The number of terms in an arithmetic series is even. The sums of the odd numbered terms (first term, third term, etc.) is 24, and the sum of the even numbered terms (second term, fourth term, etc.) is 30. The last term exceeds the first term by $\frac{21}{2}.$ Find the number of terms in the arithmetic series.

Bo is buying a board game that usually costs bb dollars. the game is on sale, and the price has been reduced by 18\%18%. which of the following expressions could represent how much bo pays for the game? choose 2 answers: choose 2 answers: (choice a) a 0.82b0.82b (choice b) b 1.18b1.18b (choice c) c b-0.18b−0.18 (choice d) d b-18b−18 (choice e) e b-0.18bb−0.18b