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If n(G-H)=15 and n(G nn H)=10, then find...

If `n(G-H)=15` and `n(G nn H)=10`, then find the value of `n(G)`.

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The correct Answer is:
25
Given `n(G-H)=15` and `n(G nn H)=10`.
`n(G)=n(G-H)+n(G nn H)`
`=15+10=25`
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