Question

2[1+2+3+4+......+n] is _____.​

Answer 1

2+2+6+8+..........+2n

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Answer 2

Answer:

4

n+1

2

n

−8

n

=

8

3

⇒

2

2n

2

(2n+2)+n

−2

3n

=

2

3

3

⇒

2

2n

2

3n

[2

2

−1]

=

2

3

3

32

n

=32

−3

⇒

n=−3

Answered By

toppr

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Step-by-step explanation:

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