Question

Find the missing number in the following series. 28, 60, 90, 117, (…), 158

• A. 132
• B. 144
• C. 140
• D. 136

Answer 1

Answer:

C. 140

• Differences: 32, 30, 27

• Second Differences: -2, -3, -4

• Next Difference: 27 - 4 = 23

• Missing Number: 117 + 23 = 140