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A calendar for $$2019$$ is made using $$4$$ sheets, each sheet having $$3$$ months. The total number of days shown in each of the four sheets $$\left(1^{\text{st}},2^{\text{nd}},3^{\text{rd}},4^{\text{th}}\right)$$ respectively is
The first three months have $$31+28+31=90$$ days. The next three have $$30+31+30=91$$ days, the next three have $$31+31+30=92$$ days, and the final three have $$31+30+31=92$$ days. Thus the required sequence is $$\left(90,91,92,92\right)$$.
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