+1277
Find the coefficient of y^4 in the expansion of (2y-5+3y^2)^6.
That's too much multiplication to try to do it manually.
So, I used a handy tool that has been put at our disposal,
i.e, https://www.symbolab.com/solver/expand-calculator
I found that the coefficient is 375. Go to there and see for yourself.
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