4 29 815 15 22 ?what will be the number in question mark?
1 answer:
Answer:
23
Step-by-step explanation:
Given:
The sequence of numbers is given as:
4 2
9 8
15 15
22 ?
Let the unknown number be 'x'.
Now, if we observe the numbers that are on the left or right side, we conclude that the difference between two numbers is increasing by 1 .
Right side: Left side:
8 - 2 = 6 9 - 4 = 5
15 - 8 = 7 ( 6 + 1) 15 - 9 = 6
22 - 15 = 7
Therefore, the next difference will also increase by 1 and will be equal to 8. So,
Adding 15 both sides, we get:
Therefore, the unknown number will be 23.
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The square root of 729 is in fact 27, as it is a perfect square, but this is not well known, so we can figure it out like this:
What goes into 729 that are perfect squares? 81 and 9:
Take the square root of 81 (9) and the square root of 9 (3). Move these to the outside of the square root (they will multiply with 3 since 3 is multiplied to the square root in the original problem)
Now, just multiply: