Find the value of r- if 20 C r -1-20 C 3 r -1A- 1B- 2C- 4D- 5

The correct options are A 1 D 5 ^20C_r+1=^20C_3r 1 ⇒ 3r 1=r+1 or (3r 1)+(r+1)=20 ⇒ 2r=2 or 4r=20 ⇒ r=1 or r=5 ...

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Pascal Triangle

Find the valu...

Question

Find the value of r, if $^{20} C_{r + 1} =^{20} C_{3 r - 1}$

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