Add : 3/4 + (-1/5) + 3/10
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firstly product of +(-1/5)will be -1/5
when we take lcm of 4 ,5 and 10
the lcm will be 20
3/4 will become 15/20
-1/5 will become -4/20
3/10will become 6/20
taking 20 as common in denominator then
(15-4+6)/20= 17/20
the answer is 17/20
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