1.

Letn=10lambda+r, where lambda,rinN, 0lerle9. A number a is chosen at random from the set {1, 2, 3,…, n} and let p_n denote the probability that (a^2-1) is divisible by 10. If r=9, then np_n equals

Answer»

`2lambda`
`2(LAMBDA+1)`
`2lambda+1`
`lambda`

ANSWER :(B)


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