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VISHWESH RAVI Grade: 12th Pass
        






















The value of 4 {nC1 + 4 . nC2 + 42 . nC3 + ...... + 4n - 1} is :
0
5n + 1
5n
5n - 1
7 years ago

Answers : (1)

Nehal Wani
21 Points
										

(1+x)n=nC0x0+ nC1x1+ nC2x2+ nC3x3+………………….+ nCnxn-1+ nCnxn


Put x=4


5n= nC040+ nC141+ nC242+ nC343+………………….+ nCn4n-1+ nCn4n


5n=nC040+4{ nC1+ nC24+ nC342+………………….+ nCn4n-2+ 4n-1}


4{ nC1+ nC24+ nC342+………………….+ nCn4n-2+ 4n-1}=5n-1


 


 


 


 


 

7 years ago
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