Teaching CSIR NET Mock Test Series Mathematical Science Algebra Divisibility In Z & Euler Function

Let n ∈ ℤ be such that n is congruent to 1 mod 7 and n is congruent to 4 mod 15. Which of the following statements are true? 

1
n is congruent to 1 mad 3.  
2
n is congruent to 1 mod 35. 
3
n is congruent to 1 mod 21.  
4
n is congruent to 1 mod 5.
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