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4/15.

Explanation: 2 over 3 is written as 2/3 and 2 over 5 is 2/5.

Now, we need to do (2/3)- (2/5).

The least common multiple of 3 and 5 (L.C.M) is 15.

(2x5/3x5)- (2x3/5x3) --------- You have to multiply the denominator with a number such that the denominator becomes the LCM we obtained, i.e., 15. As we are multiplying the denominator by a number, the numerator should also be multiplied by the same number.

Now, we have (10-6)/15 ----- The denominator is same now.

This gives us (4/15) as 10-6=4.

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Q: What is 2 over 3 - 2 over 5?
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