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1 solution
pp
I made a silly mistake and thus I can't add a solution in the solution box but I can post it here.So here it is,Because it is given that y = x − x 2 + x 3 − x 4 + . . . . ( 1 ) we can say that y = x ( 1 − x + x 2 − x 3 + . . . ) . . . . . . ( 2 ) .But − y = − x + x 2 − x 3 + x 4 − . . . . ( 3 ) . From 2 and 3 we have y = x ( 1 − y ) ⇒ x = 1 − y y .
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Still a good one!
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thanx!But how is this a Level 4 problem?!!?!!?!?
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@Adarsh Kumar – It's not me who make it a level 4 or level 3, it's the Brilliantites all over the world who decide the level of the problem...