Write the following by using - notation1 a ba-b-b cb-c-c ac-a2 a2-b2-c2-a b-b c-c a3 xy2-z2-yz2-x2-zx2-y24 a b2-a c2-a2 b-b c2-c b2-c a2

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Ratio

Write the fol...

Question

Write the following by using ∑ notation

(1) ab(a + b) + bc(b + c) + ca(c + a)

(2) a² + b² + c² − ab − bc − ca

(3) x(y² + z²) + y(z² − x²) + z(x² − y²)

(4) ab² − ac² − a²b + bc² − cb² + ca²

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If $a, b, c$ are in G.P., then ___.

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