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Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
426, 423, 414, 387, 306, ?

Option 1: 62

Option 2: 64

Option 3: 65

Option 4: 63


Team Careers360 14th Jan, 2024
Answer (1)
Team Careers360 16th Jan, 2024

Correct Answer: 63


Solution : Given:
426, 423, 414, 387, 306, ?

Subtract consecutive powers of 3 from each term to get the next term of the series –
426 – 3 1 = 426 – 3 = 423;
423 – 3 2 = 423 – 9 = 414;
414 – 3 3 = 414 – 27 = 387;
387 – 3 4 = 387 – 81 = 306;
306 – 3 5 = 306 – 243 = 63

So, 63 is the missing number of the given series. Hence, the fourth option is correct.

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