Hence,

y' - 51y2 =

- 98.

Then, placing z = y, and z2 for y, we have,

which gives, by taking the positive root, which is the one corresponding to the arithmetical enunciation,

=

22 49, and, consequently, y2 49, or y = 7.

The value of x is easily found, and is equal to 9.

Make, a = 800, n = 200, and r = 2;

a = 100, b = 200, and n = 80,

Make,

then,

a = 800, b = 1200, and n = 50.

Make,

and, making a = 70, n = 21, and r = 3, we have,

and, making a = 70, 7 = 10, and n = 21,

and, making a = 4, n = 8, and r = 8,*

and, making a = 4, l = 60, and n = 8,

we have

S =

(4 +60)

X 8 256.

First, to find the last term. We have,