In a building there are 14 pillars. The radius of each pillar is 21 cm and height 3.5 m. Find the cost of painting the curved surface area of all pillars at the rate of 12 per m². plz correct answer. b​

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is