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=0, then np_n equals

Answer»

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

ANSWER :(a)


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