Question

The value of 3/7 - 1/14 - 5/21 us

1. 5/42
2. 42/5
3. 40/5
4. 5/40​

Answer 1

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 2

Answer:

1.5/42

Step-by-step explanation:

I hope you got it

take L. C. M then you will get it