1.

If a = 2,b = 3 then find the value of (ab + ba )-1 .

Answer»

(ab + ba )-1 

= (23 + 32 )-1 

= (2 × 2 × 2 × 3 × 3)-1 

= (8 + 9)-1 

= (17)-1

= 1/17



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