Vector quiz problem 10

#1

https://online.codingblocks.com/app/player/141494/content/151863/7191/quiz/147/s/117534?q=10
not getting it how it get calculated

#2

hello @coder_girl
the link is not accessible to me.
pls share screeshot of the question or write the question in text form share it with me

#3

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