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Suppose station X sends a message with $15$ packets to station B using a sliding window of size $4$, selective repeat in used and every $5^{\mathrm {th}}$ packet is lost, the number of transmissions required to send all $\mathbf {15}$ packets to Y__________.

What is the right way to solve this question?

closed with the note: Duplicate question

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Is it 18
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$15$
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$How\ 15?\ This\ is\ what\ I\ am\ getting$

$1\ 2\ 3\ 4\ 5\ 5\ 6\ 7\ 8\ 9\ 9\ 10\ 11\ 12\ 13\ 13\ 14\ 15=18$

$Similar\ question$ $W_{s}=3$, $total\ 10\ packets\ \&\ every$ $5^{th}$ $packet\ is\ lost$=$12\ retransmission$
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Ans is 18 only, SR is mentioned
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