Summing Coefficients of a Binomial Expansion

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I don't get it.. why can you just choose x=y=1 and then get the correct answer? It seems totally arbitrary

mulimotola
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Not bad, but the level of your teaching is very low, i am aspirant of JEE advanced (toughest exam in India) , I know even a 12 th fail student can solve this, from this i m comparing your lvl with our, literally funny 😂

ghost.