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1^2 + 4^2 + 7^2 -... - (3n - 2)^2 = n(6n^2 - 3n - 1)/2


Sagot :

Answer:

1

2

+

4

2

+

7

2

.

.

.

(

3

2

)

2

=

(

6

2

3

1

)

/

2

Step-by-step explanation: