May be this is a good bet to try.
"From the following 7 groups of 7 numbers there will hit min=0 and max=-2 numbers:
group A- 1 2 10 17 21 38 49 [0]
group B- 3 8 27 31 44 45 47 [1]
group C- 4 9 16 18 42 46 48 [3+b]
group D- 5 6 11 13 25 34 37 [0]
group E- 7 14 26 29 33 35 41 [0]
group F-12 15 23 24 30 40 43 [0]
group G-19 20 22 28 32 36 39"[2]
Frank
