CBSE Class 10 Answered
please answer this question
Asked by mac12303190 | 06 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 | 06 Mar, 2010, 12:44: PM
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