2.3.4.15.12
3.4.5.28.20
4.5.6.45.30
5.6.7.66.42
6.7.8.??.56
Answer Posted / abi
15+13=28
28+(13+4)17=45
45+(17+4)21=66
so now 66+(21+4)25=91 so 91 is correct answer
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