Arithmetic and Geometric Progression
Geometric Progression to Arithmetic Progression
Let x
1, x
2, x
3, x
4 be in a geometric progression. If 2, 7, 9, 5 are subtracted respectively from x
1, x
2, x
3, x
4 then the resulting numbers are in an arithmetic progression. Then the value of

(x
1 x
2 x
3 x
4) is :