SOLUTION: the sum of n terms of 1�/1 + (1�+2�)/2 + (1�+2�+3�)/3+.......is a)(n/36)(4n�+15n+17) b) (n/36)(4n�-15n-17) c)(n/36)(4n�-15n+17) d) none

Question 941377: the sum of n terms of 1�/1 + (1�+2�)/2 + (1�+2�+3�)/3+.......is
a)(n/36)(4n�+15n+17) b) (n/36)(4n�-15n-17) c)(n/36)(4n�-15n+17) d) none
Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!
the sum of n terms of 1�/1 + (1�+2�)/2 + (1�+2�+3�)/3+.......is
a)(n/36)(4n�+15n+17) b) (n/36)(4n�-15n-17) c)(n/36)(4n�-15n+17) d) none



Substituting sum of first k squares: 


















Since , and factoring out constants,



Since , and 







Getting an LCD





Factor out n in the top, multiplying the two 6 denominators:











Edwin

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