Question

if a, b, c is positive integer and
(20-2) (20-6) (20-2) = 1680 then find
the value of ab+bc+ca=?


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Answer 1

Answer:

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Answer 2

Answer:

given,

a = ( 20 - 2 ) = 18

b = ( 20 - 6 ) = 14

c = ( 20 - 2 ) = 18

we can find ab + bc + ca = ?

18 × 14 + 14 × 18 + 18 × 18

u can solve this so u get answer....

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