Question Details

Select the number from among the given options that can replace the question mark (?) in the following series.
125, 150, 177, 207, 242, ?

Options

A

290

B

282

C

280

D

284

Show Answer

Correct Answer :

Option D

284

Solution :

The correct answer is 284.

Let us analyze the pattern in the given number series:
125, 150, 177, 207, 242, ?

We can find the differences between consecutive terms in the series:

First difference:
150 - 125 = 25
177 - 150 = 27
207 - 177 = 30
242 - 207 = 35

Now, let us examine the pattern in the differences obtained: 25, 27, 30, 35. We find the differences of these differences (second-level differences):
27 - 25 = 2
30 - 27 = 3
35 - 30 = 5

The second-level differences are 2, 3, 5, which are consecutive prime numbers.

Following this prime number pattern, the next difference in the second level should be the next prime number, which is 7.

Therefore, the next difference in the first-level differences will be:
35 + 7 = 42

Adding this difference to the last term of the series (242) gives the missing number:
242 + 42 = 284

Unlock Our Free Library

Access expert-curated educational resources and study materials—completely free.

Discover more resources

You may also like

Mock Tests

View All
  • SSC
  • intermediate
  • 1 hour
  • english, general awareness, general intelligence and reasoning, logical reasoning, quant

  • SSC
  • intermediate
  • 1 hour
  • english, general awareness, general intelligence and reasoning, logical reasoning, quant

Ask AI Tutor
5 left
Q1 View Question & Options
AI Tutor is solving this question...
Reading question context & options...