find the missing number in the following sequence 13,7,18,10,5 -9,1,12,6?
I can't see any obvious pattern
To find the missing number in the given sequence, let's first analyze the pattern:
Starting with 13, each subsequent number seems to alternate between subtracting a decreasing value and adding an increasing value.
First, let's subtract a decreasing value:
13 - 6 = 7
7 - 11 = -4
-4 - 8 = -12
Now, let's add an increasing value:
-12 + 13 = 1
1 + 17 = 18
18 + 9 = 27
The sequence so far is: 13, 7, 18, 10, 5, -9, 1, 12, 6, 27
Now, if we continue subtracting a decreasing value:
27 - 4 = 23
Thus, the missing number in the sequence is 23.