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.
78, 155, 309, ?, 1233
Option 1: 1230
Option 2: 1000
Option 3: 617
Option 4: 625
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Correct Answer: 617
Solution :
Given:
78, 155, 309, ?, 1233
In the above-given series, multiply the number by 2 and then subtract 1.
(78 × 2) – 1 = 156 – 1 = 155;
(155 × 2) – 1 = 310 – 1 = 309;
(309 × 2) – 1 = 618 – 1 = 617;
(617 × 2) – 1 = 1234 – 1 = 1233
So, 617 is the missing term in the given series. Hence, the third option is correct.
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