Question Number 2545 by Rasheed Soomro last updated on 22/Nov/15

Commented by Yozzi last updated on 22/Nov/15

Answered by Yozzi last updated on 22/Nov/15

Commented by Rasheed Soomro last updated on 22/Nov/15

Answered by Rasheed Soomro last updated on 22/Nov/15
![AN EASY Approach p(n): 3^(3n) −26n−1 is divisible by 676 Case−1_(−) :For n=1 3^(3n) −26n−1=3^3 −26−1=0 and 676∣0 Hence p(n) is true for n=1 Case−2 : Assume that for n=k , p(n) is true I−e 676 ∣ (3^(3k) −26k−1) Now for n=k+1, we have 3^(3(k+1)) −26(k+1)−1 =3^(3k+3) −26k−26−1 =27.3^(3k) −26k−27 =27.3^(3k) −27(26k)−27+26(26k) =27(3^(3k) −26k−1)+676k ∵ 676 ∣ (3^(3k) −26k−1) [By hypothesis]] and 676 ∣ 676k ∴ 676 ∣ 27(3^(3k) −26k−1)+676k ∴ p(n) is true for n=k+1,if it is true for n=k QED](https://www.tinkutara.com/question/Q2566.png)
Commented by Yozzi last updated on 22/Nov/15

Commented by Rasheed Soomro last updated on 23/Nov/15
