यदि A = {λ, {λ, μ}}, है तो A का घात सम्मुच्चय (पॉवर सैट) है?

1
{ϕ, {ϕ}, {λ}, {λ, μ}}  
2
{ϕ, {λ}, {{λ, μ}}, {λ, {λ, μ}}}
3
{ϕ, {λ}, {λ, μ}, {λ, {λ, μ}}}
4
{{λ}, {λ, μ}, {λ, {λ, μ}}}

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