Q. 54.0( 3 Votes )

# Write the value of .

We know,

nCr + nCr-1 = n+1Cr

Now, we have,

56-rC3 + 50C4

= 55C3 + 54C3 + 53C3 + 52C3 + 51C3 + 50C3 + 50C4

= 55C3 + 54C3 + 53C3 + 52C3 + 51C3 + 51C4

= 55C3 + 54C3 + 53C3 + 52C3 + 52C4

= 55C3 + 54C3 + 53C3 + 53C4

= 55C3 + 54C3 + 54C4

= 55C3 + 55C4

= 56C4

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