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^nC(r)+^(n)C(r-1)=^(n+1)C(r)...

^nC_(r)+^(n)C_(r-1)=^(n+1)C_(r)

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Prove that ""^nC_r+^nC_(r-1)=^(n+1)C_r

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If 2lerlen show that ^nC_r +2 ^nC_(r-1) +^nC_(r-2)=^(n+2)C_r

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Prove that .^(n+1)C_(r+1)+^nC_r+^nC_(r-1)=^(n+2)C_(r+1)

Write the expression ^nC_(r+1)+^(n)C_(r-1)+2xx^(n)C_(r) in the simplest form.

The value of nC_(r-3)3^(n)C_(r-2)+3^(n)C_(r-1)+nC_(r) is equal to

Show that ^nC_r+2. ^nC_(r-1)+ ^nC_(r-2)= ^(n+2)C_r