A wishes to prove, by secondary evidence, the contents

945, 1890, ?, 504, 144, 32

What will come in place of the question mark (?) in the following series?

25, 41, 73, ?, 185, 265

52      83      114      ?      176       207

16      25      36      49      64       ?

What will come in place of (?) question mark in the given number series.

13, 15, 18, 23, 30, ?

Find the missing number in the given number series.

4, ?, 110, 665, 4660, 37285

(14.073)² + (32.103)² + (43.9653)² + (52.983)² + ? = (102.45)² + (98.007)²

What will come in place of the question mark (?) in the following series?

121, 110, 97, ?, 61, 38

5, 5, 15, 75, ?, 4725

18, 30, 50, 102, 282, ?