Exams › SSC CGL (Prelims) › Reasoning
Select the number from among the given options that can replace the question mark (?) in the following series: 23, 27, 43, 79, 143, ?
- 240
- 243
- 250
- 200
Correct answer: 243
Solution
The differences are 4, 16, 36, 64, which are squares of even numbers: 2^2, 4^2, 6^2, 8^2. The next difference is 10^2 = 100, so 143 + 100 = 243. Hence, the missing term is 243.
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