Question

Calculeaza: S= 1supra2+1supra2 la puterea 2+1supra2la puterea 3 + 1supra2la puterea 4 + 1supra2la puterea 5 + 1supra2la puterea 6 + 1supra2la puterea 7 + 1supra2la puterea 8 + 1supra2la puterea 9

Answer 1

1/2+(1/2)^2+(1/2)^3+(1/2)^4+(1/2)^5+(1/2)^6+(1/2)^7+(1/2)^8+(1/2)9=(1/2)^1+2+3+4+5+6+7+8+9=

(1/2)^3+4+11+15+9=(1/2)^7+35=(1/2)^42