Update lesson.yaml#501
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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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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.