Achessboard has 64 squares. george places 1 grain of rice on the first square, 2 grains on the second square, 4 grains on the third square, 8 grains on the fourth square, and so on, until he has placed grains of rice on 10 squares

Total grains =1023 grains

Step-by-step explanation:

Number of grains on 1st square = 1

Number of grains on 2nd square = 2

Number of grains on 3rd square = 4

Number of grains on 4th square = 8

Number of grains on 10th square = 512 grains

Total number of grains =?

Total number of grains in the 10 squares =  S10= a(r^n-1)/r-1

=1(2^10-1)/2-1

=1(1024-1)/1

=1024-1 = 1023

Total number of grains in 10 squares = 1023

40% off the regular price is the correct answer.

step-by-step explanation:

i believe the correct answer is option 4.principalities were small territories that were run by russian rulers.

which statement correctly defines principalities in northern asia in the 1200s? principalities were small territories that were run by russian rulers.

hope i could ! : )