Answer :
ya – b × yb – c × yc – a = y(a-b + b-c + c-a)
(Product Rule: am × an = am + n , where ‘a’ is a real no. and m, n are positive integers.)
⇒ ya – b × yb – c × yc – a = y(a-a + b-b-c + c)
⇒ ya – b × yb – c × yc – a = y0
⇒ ya – b × yb – c × yc – a = 1
(∵ Number with zero exponent rule: If ‘a’ is a rational no. other than zero, then a0 = 1)
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