গাণিতিক ধাঁধা / Mathematical Puzzle

উত্তর একটু নিচেই দেখুন

Answer is little below

Answer: 11

Explanation:

Look at The 1st Box : 3 X2+1=7

Look at The Last Box :3 X4+1=13

Look at The 2nd Box : 5 X2+1=11

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