Mashaal Masha
Which of the following is equivalent to

$(1-p)(1+p+p^{2}+p^{3}+p^{4}+p^{5}+p^{6})$?
Difficulty: Medium
A: 

$1-p^{8}$

B: 

$1-p^{7}$

C: 

$1-p^{6}$

D: 

$1-p^{5}$

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