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(243)n/5 x 32n + 1/9n x 3n - 1 = ?

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1. 

(243)n/5 x 32n + 1= ?

9n x 3n - 1

 

[A]. 1
[B]. 2
[C]. 9
[D]. 3n

Answer: Option C

Explanation:

Given Expression

= (243)(n/5) x 32n + 1

9n x 3n - 1

 

= (35)(n/5) x 32n + 1

(32)n x 3n - 1

 

= (35 x (n/5) x 32n + 1)

(32n x 3n - 1)

 

= 3n x 32n + 1

32n x 3n - 1

 

= 3(n + 2n + 1)

3(2n + n - 1)

 

=

33n + 1

33n - 1

 

= 3(3n + 1 - 3n + 1)   = 32   = 9.

 

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