What is the topmost number of the above number tower?

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Solution

The correct option is B 8

We can observe that $1 + 2 = 3$ and $2 + 3 = 5.$

The number on the higher floor of the tower is the sum of the two numbers beneath it on the floor just below it.

$∴$ The number on the top floor is $3 + 5 = 8.$

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