Find the missing number.
Find the missing number.
21 17 13 12 19 19 9 14 17 24 22 ?
A12
B15
C18
D20
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Find the missing number.
21 17 13 12 19 19 9 14 17 24 22 ?
Answer is : 20
21+3=24,
17+5=22,
13+7=20
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