Question : Directions: In the following question, select the missing number of the given series.
1, 5, 21, 85, 341, ?
Option 1: 1380
Option 2: 1365
Option 3: 1360
Option 4: 1370

Question

Question : Directions: In the following question, select the missing number of the given series.
1, 5, 21, 85, 341, ?

Option 1: 1380

Option 2: 1365

Option 3: 1360

Option 4: 1370

Team Careers360 · Accepted Answer

Correct Answer: 1365

Solution : Given:
1, 5, 21, 85, 341, ?

Add the square of the even number which is twice the previously added number, to get the required missing number in the series –
1 + 2² = 1 + 4 = 5;
5 + 4² = 5 + 16 = 21;
21 + 8² = 21 + 64 = 85;
85 + 16² = 85 + 256 = 341;
341 + 32² = 341 + 1024 = 1365

So, the missing number in the series is 1365. Hence, the second option is correct.

Popular Searches

Question : Directions: In the following question, select the missing number of the given series.
1, 5, 21, 85, 341, ?
Option 1: 1380
Option 2: 1365
Option 3: 1360
Option 4: 1370

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Popular Searches

Question : Directions: In the following question, select the missing number of the given series. 1, 5, 21, 85, 341, ?Option 1: 1380Option 2: 1365Option 3: 1360Option 4: 1370

Related Questions

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Question : Directions: In the following question a series is given, with one number missing. select the missing number from the given alternatives. 120, 119, 115, 106, 90, ?Option 1: 75Option 2: 65Option 3: 77Option 4: 62

Question : Directions: In the following question a series is given, with one number missing. Select the missing number from the given alternatives. 104, 52, 26, 13, 6.5, ?Option 1: 3.5Option 2: 3.75Option 3: 4.25 Option 4: 3.25