Identify the missing number.

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Solution

The correct option is D 21
The operations and numbers are following the pattern shown with arrows.

2 + 5 = 7
7 − 3 = 4
4 $\times$ 4 = 16

1 + 6 = 7
7 − 2 = 5
5 $\times$ 7 = 35

10 + 8 = 18
18 − 9 = 9
9 $\times$ 2 = 18

12 + 1 = 13
13 − 6 = 7
7 $\times$ 3 = 21

Hence, the missing number is 21.

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