find the sum of the following rational numbers .
a.12/21 and -17/-21
b.1/6 and 3/8
c.13/-18 and 16/27
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Answer:
a. -5/21
b.1/6-1×8/6×8 + 3/8- 3×6/8×6
= 8/48 + 18/48
=8+18/48
=26/48
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