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Question Number 176836 by Ar Brandon last updated on 27/Sep/22

$$\mathrm{s}({\mathrm{B}}^{\prime }-{\mathrm{A}}^{\prime })=4$$$$\mathrm{s}(\mathrm{B}-\mathrm{A})=6$$$$\mathrm{s}\left(\mathrm{A}\right)=9$$$$\mathrm{What}\mathrm{is}\mathrm{the}\mathrm{number}\mathrm{of}\mathrm{subsets}\mathrm{of}\mathrm{B}\mathrm{with}$$$$\mathrm{at}\mathrm{most}2\mathrm{elements}?$$

Commented by Rasheed.Sindhi last updated on 27/Sep/22

$$\mathrm{s}(\mathrm{B}-\mathrm{A})\ne 6$$$$\mathrm{s}\left(\mathrm{A}\right)\ne 9$$$$Asetwithnelementshas{2}^{n}subsets.$$

Commented by Ar Brandon last updated on 28/Sep/22

s(x) here is number of elements of x, Sir

Commented by Rasheed.Sindhi last updated on 28/Sep/22

$$\mathcal{T}han\mathcal{X}toclarifysir,Ithoughtit$$$$numberofsubsets.$$

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