Select the number that can replace the question mark (?)…

Select the number that can replace the question mark (?) in the following pattern.

Show answer & explanation

Correct answer: C

Explanation

The correct answer is option 3 i.e 31.

Understanding	Application
The logic used here is: Difference between the square of base numbers is the apex number. Figure 1: 25² - 5² = 600 Figure 2: 27² - 3² = 720	Similarly, Figure 3: x² - 9² = 880 ⇒ x = 31 Thus, the missing number is 31.

Understanding

Application

The logic used here is:

Difference between the square of base numbers is the apex number.

Figure 1: 25² - 5² = 600

Figure 2: 27² - 3² = 720

Similarly,

Figure 3: x² - 9² = 880

⇒ x = 31

Thus, the missing number is 31.

SSC CHSL 2020 PYQ — Question 94