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I have no idea how to do them, please help me solve these questions. 1) nC1+nC2=3n 2)Find the constant term in the expansion of (x+2)6((1/x2)-1)2 And finally, 3) Given that (2+(x/10))n=1024+ax+bx2+terms involving higher powers of x. (a) Find the value of n. (b) Find the values of a...