Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
3, 6, 18, 21, 63, 66, ?
Option 1: 181
Option 2: 160
Option 3: 147
Option 4: 198
Correct Answer: 198
Solution :
Given:
3, 6, 18, 21, 63, 66, ?
In the above-given series, add and multiply 3 alternatively to the previous term to get the next term –
3 + 3 = 6; 6 × 3 = 18; 18 + 3 = 21; 21 × 3 = 63; 63 + 3 = 66; 66 × 3 = 198
So, 198 is the missing term of the series. Hence, the fourth option is correct.
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