- 12
- 18
- 20
- 22
- b
-
Its called double series.
6+4=10 8+3=11
10+4=14 11+4=15
14+4=18 15+5=20
Its called double series.
6+4=10 8+3=11
10+4=14 11+4=15
14+4=18 15+5=20
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