If a, b and c are in GP and a^1/x=b^1/y=c^1/z. The value of 2y is?

If a , b , c are in AP and x , y and z are in GP , then $${x^{b-c}.{y^{c-a}.z^{a-b}=?}}$$

If the arithmetic mean of 6, 8, 10. x, 7 is 8.the value of x will be

Direction (66-70): What should come in place of the question mark(?) in the following number series?

12664   34    20  14 ?

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

15     ?    24    33     97    122     

What should come in place of the question mark '?' in the following number series?

77, 76, 84, 57, ?, – 4

Find the next term in the series.

1329, 997, 725, 507, 337, ?

What should come in place of the question mark '?' in the following number series?

17, 52, 158, 477, ? , 4310