Question 15
i. If n is a positive integer , then 7^2n – 4 is divisible by
(a) 25
(b) 26
(c) 2309
(d) none
Answers
Answered by
0
Expression is a
n
+b
n
The expression is never divisible by (a−b).
When n is odd, it is divisible by(a+b).
When n is even it is not divisible by (a+b)
So, it is not divisible by (a−b)(a+b)=a
2
−b
2
, when n is even.
The correct answer is option D.
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oops sorry................none is Answer
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