SAT Math Practice Question #28125 - SATify | SATify

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SAT Math Practice Question #28125 - SATify | SATify

#28125

number theory

divisibility

hard

150 sec

For how many positive integers $n$ does $1 + 2 + \dots + n$ evenly divide $10 (n^{2} - 1)$ ?

A.

4

B.

5

C.

6

D.

7

E.

8