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Update lesson.yaml #501

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Update lesson.yaml #501

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@YHx07 YHx07 commented Apr 10, 2022

Sollution #498

This problem with "!" in the beginning of line:
Hint: !is.na(c(3, 5, NA, 10)) will negate the previous command, thus telling us what is NOT NA.

Sollution swirldev#498

This problem with "!" in the beginning of line:
Hint: !is.na(c(3, 5, NA, 10)) will negate the previous command, thus telling us what is NOT NA.
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