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Find the Missing Number

ANSWER= 45
Explanation: So we have the following equations; 1 + 4 = 5 2 + 5 = 12 3 + 6 = 21 of the form; a + b = c So we can find the actual operations are as follows; a x (b + 1) = c So in the equations let’s see if this is followed; 1 + 4 = 5 :: 1 x (4 + 1) = 1 x 5 = 5 2 + 5 = 12 :: 2 x (5 + 1) = 2 x 6 = 12 3 + 6 = 21 :: 3 x (6 + 1) = 3 x 7 =21 Therefore, if we apply the same to the equation with the missing number we can find the result; 5 + 8 = ? :: 5 x (8 + 1) = 5 x 9 = 45 Hence, Answer = 45.