Answer is 20
first row numbers will come by adding 1
2nd row adding 2
third row adding 4
3 3 3

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Alternative. If we take it horizontally, 3×2=6, 6×2=12 4×2=8, 8×2=16 Similarly, 5×2=10, 10×2=20. You just hv to multiply wid 2...
4 2 4