Question

find the missing number 3 5 1 7 = 16, 3 5 2 8 =24, 7 4 3 1 =?

Answer 1

Answer:

11

Step-by-step explanation:

In the first case,    3  5  1   7 = 16  =>  $(\frac{3+5}{2} )*(\frac{1+7}{2}) = 16$

In the second case also , 3  5  2  8 =24 =>  $(\frac{3+5}{2})* (\frac{2+8}{2})=24$

therefore, 7  4  3  1  =  $(\frac{7+4}{2})*( \frac{3+1}{2}) = 11.$