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Question Number 9325 by tawakalitu last updated on 30/Nov/16

Answered by RasheedSoomro last updated on 30/Nov/16

$$\left(\mathrm{B}\right)12$$$$25\equiv -1\left(\mathrm{mod}13\right)$$$${\left(25\right)}^{15}\equiv {(-1)}^{15}\left(\mathrm{mod}13\right)$$$${\left(25\right)}^{15}\equiv -1\left(\mathrm{mod}13\right)$$$${\left(25\right)}^{15}\equiv -1+13\left(\mathrm{mod}13\right)$$$${\left(25\right)}^{15}\equiv 12\left(\mathrm{mod}13\right)$$

Commented by tawakalitu last updated on 30/Nov/16

$$\mathrm{Thanks}\mathrm{so}\mathrm{much}\mathrm{sir}.$$

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