Optical Illusion IQ Test: Locate the absent digit Puzzles are a multipurpose tool that assist people of all ages and pupils alike. They operate as mental exercises that improve problem-solving skills and activate cognitive functions.
Introducing the challenge
This is the ultimate test of your rapid thinking and mathematical skills. There’s an enticing challenge in front of you: a pyramid of numbers with a question mark in place of a critical digit. Your goal? to quickly (30 seconds) swap that question mark for the right number.
Here is the solution
Consider the pyramid’s numbers as following a sequence: 2,3,4,8,11,20,30,?,80, and 132. As demonstrated below, add two consecutive numbers, then switch the sum between +1 and -1. 2 + 3 – 1 = 4, 3 + 4 + 1 equals 8. 4 – 8 – 1 = 11 8 plus 11 plus 1 equals 20, 11 plus 20 minus 1 equals 30, 20 + 30 + 1 equals 51. To be sure you have the solution correct, you can similarly verify for the remaining digits. 51 + 80 + 1 = 132, 30 + 51 – 1 = 80
Thus, the number that has been substituted for the question mark is known to fit perfectly into the sequence.
