Answers

2015-11-15T18:46:02+05:30
1st- 1+2=7
how? .
ans (1×2) ×2 +(1+2)=7
(3×4) ×2 +(3+4)=31 
and so on..........
so (9×10) ×2 +(9+10)=199 
plz mark it d best ..
2 3 2
  • Brainly User
2015-11-15T18:52:22+05:30
ANSWER IS 199.........................
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