Verified Answer :

jhonyy9

use math induction proof method will be usefully 

for n=1 will get 

1^2 = 1(61^2 -31 -1)/2
1 = 1(6-4)/2
1 = 1(2)/2
1 = 1

suppose true for n=k and prove for k = k+1 

hope this will help you

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