Question

In an AP first term is 30; the sum of first three terms is 300, write third terms

• A. 130
• B. 170
• C. 190
• D. 150

Answer 1

Answer:

B. 170

first term is 30 second term = 30 + d third term = 30 + 2d 30 + 30 + d + 30 + 2d = 300 90 + 3d = 300 3d = 300 - 90 = 210 d = 210/3 = 70 first term = 30 second term = 30 + 70 = 100 third term = 100 + 70 = 170