Select the odd group of numbers. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g.13 – Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

Question

Question

This question was previously asked in

SSC CGL 2022 Tier-I Official Paper (Held On : 01 Dec 2022 Shift 4)

Answer 1

The pattern followed here is:

Logic: First number : (First number)² :(First number)² - 5

Let's check each option one by one.

Option 1) (15 - 220 - 215)

⇒ 15 : (15)² : (15)² - 5

⇒ 15 : 225 : 220 ≠ 15 - 220 - 215

Option 2) (10 - 100 - 95)

⇒ 10 : (10)² : (10)² - 5

⇒ 10 : 100 : 95 = 10 : 100 : 95

Option 3) (20 - 400 - 395)

⇒ 20 : (20)² : (20)² - 5

⇒ 20 : 400 : 395 = 20 : 400 : 395

Option 4) (25 - 625 - 620)

⇒ 25 : (25)² : (25)² - 5

⇒ 25 : 625 : 620 = 25 : 625 : 620

Hence, the correct answer is "Option 1".