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| revprev | Admin | May 8'23 at 1:32 | +109 | m | |
| revcur | Admin | (Created page with "'''Solution: C''' <math display = "block"> \operatorname{E}(\frac{X}{1-X}) = 60 \int_0^1 \frac{x}{1-x} x^3 (1-x)^2 dx = 60 \int_0^1 x^4(1-x) dx = 60(x^5/5 - x^6/6) \Big |_0^1...") | May 8'23 at 1:29 | +391 |