Each three – digit numbers is written in a paper slip and put in a b

1.	Each three – digit numbers is written in a paper slip and put in a box. If one slip is drawn form it, what is the probability of its being a multiple of 9 which ends in 5?(1) 1 / 9 (2) 1 / 18 (3) 1 / 90 (4) 1 / 100
Answer» (3) 1 / 90 Multiple of ends in s mean add multiple of 45 a = 135 , d = 90 ; an = 945 945 = 135 + (n -1) d; d = 90 ⇒ n = 10 ∴ Probability = 10/900 = 1/90

Each three – digit numbers is written in a paper slip and put in a box. If one slip is drawn form it, what is the probability of its being a multiple of 9 which ends in 5?(1) 1 / 9 (2) 1 / 18 (3) 1 / 90 (4) 1 / 100

Answer»

(3) 1 / 90

Multiple of ends in s mean add multiple of 45

a = 135 , d = 90 ; an = 945

945 = 135 + (n -1) d; d = 90

⇒ n = 10

∴ Probability = 10/900 = 1/90

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Each three – digit numbers is written in a paper slip and put in a box. If one slip is drawn form it, what is the probability of its being a multiple of 9 which ends in 5?(1) 1 / 9 (2) 1 / 18 (3) 1 / 90 (4) 1 / 100

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