A = 1d = 2L = 49=> a + (N-1)d = 49=> 1 + (n-1) (2) = 49=> (n-1) (2) = 48=> n - 1 = 24=> n = 25Required sum = n/2 [ a + L]= 25 / 2 [ 1 + 49]= 25 × 50 / 2= 25 × 25= 625
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