How much is 2 times 1 in 3 plus 3 times 1 in 4 to 9 times 1 in 10

2 times 1 in 3 plus 3 times 1 in 4 plus 9 times 1 in 10 equals
=1/3+1/3-1/3+1/4-1/4.+1/9-1/10
=1/3-1/10
=7/30

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