What should come in place of the question mark (?) in the following sequence:

Detailed Explanation:
Pattern: In each figure, the difference between upper two numbers equals the difference between lower two numbers.
First figure: Upper: 21 – 16 = 5; Lower: 15 – 10 = 5 ✓
Second figure: Upper: 10 – 7 = 3; Lower: 13 – 10 = 3 ✓
Third figure: Upper: 21 – 14 = 7; Lower: ? – 15 = 7, so ? = 22
Question 2 of 6 Series Completion (Alphabet & Number)
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