Question

Число (1+1/2)(1-1/3)(1+1/4)(1-1/5)(1+1/6)(1-1/7)(1+1/8)(1-1/9)равно ?

Answer 1

$frac32cdotfrac23cdotfrac54cdotfrac45cdotfrac76cdotfrac67cdotfrac98cdotfrac89=1$