Question

Without doing the actual addition find the sum of 1+3+5+7+9+..............51+53​

Answer 1

Answer:

Step-by-step explanation:

it is an AP

53= a+(n-1)d

53-1 = (n-1)2

52/2= n-1

n=27

sum of AP is

 Sn= n/2 x (a+l)

      =27/2 x (1+53)

      = 27 x 27  

      =  729

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