Question

What isFrist formula of rationl number

Answer 1

0.7777..... Period=7 Periodicity=2 Let x=0.777....-1 Multiply 1with 10 10×x=0.7777.....×10 10x=7.777....-2 Subtract 1 from 2 10x=7.777...-2 -1x=0.7777...-1 --------------------- 9x=7.00000...... ---------------------- 9x=7 X=7/9