27-7(a). If r12 = r3 r23 =r, (r # 1), then prove that R1,23 = R231 = R3-12 = r , V(1+r) %3D (b) If R123 = 1, prove that R231 = R3,12 = 1. %3D %3D

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A: Use the property of external direct product to find the identity of the group G.

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A: X~N(0,1) and Y~N(1,4)

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Q: 2. (a) Show that (z − 1)(26 + 25 + 24 + z³ + z²+z+1) = z7 - 1. (b) Show that if ¢ is a 7th root if…

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