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Zina [86]
3 years ago
14

Sum of n terms 1x2+2x3+3x4+4x5+...

Mathematics
1 answer:
lozanna [386]3 years ago
6 0

Answer:

1/3(n+1)³

Step-by-step explanation:

1x2+2x3+3x4+4x5+...= 1²+1+2²+2+3²+3+...+n²+n+1=

=(1²+2²+3²+...+n²)+(1+2+3+...+n+1)=

=1/6n(n+1)(2n+1)+1/2(n+1)(1+n+1)=

=1/6(n+1)(n(2n+1)+3(n+2))=

=1/6(n+1)(2n²+4n+2)=

=1/6(n+1)*2(n+1)²=

=1/3(n+1)³

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Answer:

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jeka57 [31]

The average of anything is calculated by adding up all the terms in the data set and dividing by the amount of terms in the data set.

In this problem,

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3 years ago
What is the answer!!
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∠ G = 121°

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