During the months of October Krishna went to a temple every day. He offered 4 flowers to her favourite deity. At the end of the month, he noticed that he did not offer the same combination of flowers on any two days during the month. What is the minimum number of varieties of flowers offered by Krishna during the month? 

<p><span lang="EN-IN">Let he offered 'n' different flowers </span></p><p><span lang="EN-IN">October has 31 days </span></p><p>^{<span lang="EN-IN">n</span>}<span lang="EN-IN">C₄&nbsp; </span><span lang="EN-IN">³</span><span lang="EN-IN"> 31 </span></p><p><span lang="EN-IN">Minimum value of n can take 7 </span></p>

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