The cards are numbered from 1 to 49.∴ Total number of outcomes = 49The odd numbers from 1 to 49 are 1, 3, 5,..., 49.The numbers 1, 3, 5,..., 49 are in AP.Here, a = 1 and d = 2.Suppose there are n terms in the AP. ∴ an​ = 49 ⇒ 1 + ( n − 1 ) × 2 = 49 [ an​ = a + ( n − 1 )d ] ⇒ 2n − 1 = 49 ⇒ 2n = 49 + 1 = 50 ⇒ n = 25So, the favourable number of outcomes are 25. ∴ P(number on the drawn card is odd) = Total number of outcomes  Favourable number of outcomes​ = 4925​