Complete the missing entries in the following factor tree.

Question:

Complete the missing entries in the following factor tree.

Solution:

We need to fill the values for a and b in the following factor tree:

It is clear from the factor tree above that

$b=3 \times 7$

$b=21$

Also,

$a=2 \times b$

$a=2 \times 21$

$a=42$

Thus, the missing entries are 21and 42.

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