Asked by Anonymous
it the nth of a sequence is denoted by the formula n(2n+1)-3n find the sum of d first four terms
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Answered by
Anonymous
2 n^2 + n -3n = 2 n^2 - 2 n = 2 n(n-1)
n = 1 ---> 0
n = 2 ---> 4
n = 3 ---> 12
n = 4 ---> 24
sum = 16+24 = 40
n = 1 ---> 0
n = 2 ---> 4
n = 3 ---> 12
n = 4 ---> 24
sum = 16+24 = 40
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