Question

Complete the series, 6, 15, 35, 77, 143,.....

• A. 297
• B. 221
• C. 263
• D. 241

Answer 1

Answer:

B. 221

Prime numbers =2, 3, 5, 7, 11, 13, 17 2x3=6, 3x5=15, 5x7=35, 7x11=77 ,11x13=143, 13x17=221