Question

please solve this problem guys​

Answer 1

Answer:

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Step-by-step explanation:

Let S=2+3.2+4.2

2

+5.2

3

+6.2

4

+.........n2

n−2

...(i)

Multiplying both sides by 2, we get

2S=2.2+3.2

2

+4.2

3

+5.2

4

+6.2

5

+.........+(n−1)2

n−2

+n2

n−1

...(ii)

Subtracting (i) from (ii), we get

−S=2+2+2

2

+2

3

+.........+2

n−2

−n2

n−1

−S=2+2(

2−1

2

n−2

−1

)−n2

n−1

S=(n−1)2

n−1