If underset(i=1)overset(20)Sigma((.^(20)...

If `underset(i=1)overset(20)Sigma((.^(20)C_(i-1))/(.^(20)C_(i)+.^(20)C_(i-1)))^(3)=(k)/(21)`, then k equals

A

100

B

400

C

200

D

50

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The correct Answer is:

A

If underset(i=1)overset(20)Sigma((.^(20)C(i-1))/(.^(20)C(i)+.^(20)C(i-...
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1.^(20)C(1)-2.^(20)C(2)+3.^(20)C(3)-...-20.^(20)C(20)
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The value of .^(20)C(10)+.^(20)C(1)+.^(20)C(2)+.^(20)C(3)+.^(20)C(4)+....
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If sum(i=1)^(20)((""^(20)C(i-1))/(""^(20)C(i)+""^(20)C(i=1)))^(3)=k/21...
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निम्नलिखित के मान ज्ञात कीजिए : .^(20)C(1)+.^(20)C(2)+.^(20)C(3)+......
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The sum ""^(20)C(0)+""^(20)C(1)+""^(20)C(2)+……+""^(20)C(10) is equal t...
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