Which list of a triangle’s side lengths is impossible? (GMAT Quants)

Which list of a triangle’s side lengths is impossible? a. 4, 7, 4 b. 2, 3, 7 c. 2, 8, 7 d. 5, 6, 7

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If ( X^a x Y^b x Z^c) equals the product of 154 and 56... (GRE Quant)

If ( X^a x Y^b x Z^c) equals the product of 154 and 56, z > y > x, and a > b > c, then what is the value of (a^X x b^Y x

I've received my IELTS TRF i got l=8,r=7, w=6, s-7, overall band=7

Should i try for one more attempt or go ahead with this score?