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During transmission over a certain binary communication channel, bit errors occur independently with probability $p$. The probability of AT MOST one bit in error in a block of $n$ bits is given by

1. $p^{n}$
2. $1-p^{n}$
3. $n p(1-p)^{n-1}+(1-p)^{n}$
4. $1-(1-p)^{n}$