A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
122, 197, 290, ?
- A399
- B400
- C401
- D402
Solution & Step-by-step Explanation
Let's look for a pattern in the given terms:
122=11
2
+1
197=14
2
+1
290=17
2
+1
The base numbers form an arithmetic progression with a common difference of +3:
11
+3
14
+3
17
+3
20
Therefore, the missing term is:
20
2
+1=400+1=401
122=11
2
+1
197=14
2
+1
290=17
2
+1
The base numbers form an arithmetic progression with a common difference of +3:
11
+3
14
+3
17
+3
20
Therefore, the missing term is:
20
2
+1=400+1=401