The following question was asked in a mock test for which I am preparing and I was unable to solve it.
What is the missing number? It must be one of these answers:
The pattern I saw was that each block is the sum of the two directly below it, divided by two. For example, 5 (the top number) = (8 + 2) / 2. Using this pattern I got -1 as the answer but it's not an option and I am unable to see any other pattern.
So, can someone please tell me how should I attempt the question?