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Take the second group (2,3)-- Sum = 5
Third group (4,5,6)--- Sum = 15
Fourth group (7,8,9,10)-- Sum = 34
Option A:
n*(n^2+1)/2
second group, n= 2... 2*(2^2+1)/2 = 2*5/2 = 5
Third group, n= 3... 3*(3^2+1)/2 = 3*10/2 = 15
Fourth group, n= 4..4*(4^2+1)/2 = 4*17/2 = 34
Hence for nth group, n='n'... n*(n^2+1)/2 holds true for the sum
Hence, Option A is the answer.
Hope it helps.
Third group (4,5,6)--- Sum = 15
Fourth group (7,8,9,10)-- Sum = 34
Option A:
n*(n^2+1)/2
second group, n= 2... 2*(2^2+1)/2 = 2*5/2 = 5
Third group, n= 3... 3*(3^2+1)/2 = 3*10/2 = 15
Fourth group, n= 4..4*(4^2+1)/2 = 4*17/2 = 34
Hence for nth group, n='n'... n*(n^2+1)/2 holds true for the sum
Hence, Option A is the answer.
Hope it helps.
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