SOLUTION: 87. Find the next number in the series: 1, 7, 21, 46, 85, 141,? A. 207 B. 217 C. 227 D. 237

Algebra ->  Sequences-and-series -> SOLUTION: 87. Find the next number in the series: 1, 7, 21, 46, 85, 141,? A. 207 B. 217 C. 227 D. 237      Log On


   

Question 610090: 87. Find the next number in the series:
1, 7, 21, 46, 85, 141,?
A. 207
B. 217
C. 227
D. 237
Answer by flame8855(424) About Me  (Show Source):
You can put this solution on YOUR website!
1, 7, 21, 46, 85, 141
series has differences
6, 14, 25, 39, 56,
which has differences
8, 11, 14, 17,
11-8 = 3
so 17 +3 =20
20+56 = 76
141+76 = 217
so the answer is B. 217