Question

Find the sum of n terms of the series
1² - 2² + 3² - 4² + 5² - 6² + ......... ​

Answer 1

Step-by-step explanation:

1-4+9-16+25-36+n

-3+(-7)+(-11)+n

-3-7-11+n

10-11+n

-1+n

Answer 2

Hi

1²-2²+3²-4²………..this the given series

(1+2)(1-2)+(3+4)(3-4)+………

From this we get

-(3,7,11………)

$S_n$=[n(2a+(n-1)d)]/2

Substituting a and d value

We can get Ur answer