IF 11 = 20
12 = 31
13 = 42
14 = 53
Then 18 = ?
Answer with Explanation
Answer is 97.
How?
11 => (1+1)(1-1) => 20
12 => (2+1)(2-1) => 31
13 => (3+1)(3-1) => 42
14 => (4+1)(4-1) => 53
similarly
18 => (8+1)(8-1) => 97
Number Puzzle #16
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