The value of 3/7 - 1/14 - 5/21 us1. 5/422. 42/53. 40/54. 5/40

1.	The value of 3/7 - 1/14 - 5/21 us1. 5/422. 42/53. 40/54. 5/40
Answer» Step-by-step EXPLANATION: the LCM of 7, 14 and 21 is 42. therefore, $\frac{3}{7} - \frac{1}{14} - \frac{5}{21}$ → $\frac{3 \times 6}{7 \times 6} - \frac{1 \times 3}{14 \times 3} - \frac{5 \times 2}{21 \times 2}$ → $\frac{18}{42} - \frac{3}{42} - \frac{10}{42}$ → $\frac{18 - 3 - 10}{42}$ → $\frac{5}{42}$ so answer is 5/42. ALTERNATIVELY the LCM of 7, 14 and 21 is 42. So, your answer should have 42 in DENOMINATOR. Only option (1) has 42 in denominator

Answer»

Step-by-step EXPLANATION:

the LCM of 7, 14 and 21 is 42.

therefore,

$\frac{3}{7} - \frac{1}{14} - \frac{5}{21}$