please answer this question

Asked by mac12303190 | 6th Mar, 2010, 12:11: AM

Expert Answer:

The series is 2, 22, 32...................

first term, a= 2

common difference = 2 2 - 2 = 2

Sum of n terms = (n/2) (2a + (n-1)d)

                             = (n/2) (22 + (n-1)2)

                            = (n/2) (2 + 2n)

                           = (n(1+n)/2)

Answered by  | 6th Mar, 2010, 12:44: PM

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