Infosys Company Numerical Ability Algebra

(a-X)(b-X)(c-X)..........upto(z-X)=?

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Infosys Other Question

1 chocolate cost is Rs.1 & if we return 3 wrapers(covers) of chocolate we get 1 more chocolate. If u have Rs.15 how many chocolates do u get...? . If x and y are both positive integers, how much greater is x than y?
1. x + y = 20
2. x = y²