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if^nCr+^nC(r+1)=^(n+1)cxthen the value o...

if``^nC_r+`^nC_(r+1)=`^(n+1)c_x`then the value of x is

A

a)r

B

b)r+1

C

c)r-1

D

d)n

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UNITED BOOK HOUSE-BETHUNE COLLEGIATE SCHOOL.-EXERCISE
  1. tanalpha=3/4and alpha+beta=45^@then tanbeta=

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  2. If Z=(sqrt3+i)/2,then the value of z^69is

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  3. if^nCr+^nC(r+1)=^(n+1)cxthen the value of x is

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  4. If a,b,c are in A.P .then 3^a,3^band 3^care in

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  5. If the slope of the line joining the points (3lambda,4)and (4,-3lambda...

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  6. If lim(xrarr3)(alphax^2-beta)/(x-3)=12,then find the value of alpha an...

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  7. For any three sets A,B and C,if AcapC=BcapCand AcapC^c=BcapC^cthen sho...

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  8. If f(x)=a(x-b)/(a-b)+b.(x-a)/(b-a)then show that f(a)+f(b)=f(a+b).

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  9. Prove that (1+sec2A)(1+sec2^2A)(1+sec2^3A).....(1+sec2^nA)=(tan2^nA)/(...

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  10. Prove that ,tan(alpha+beta)tan(alpha-beta)=(sin^2alpha-sin^2beta)/(cos...

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  11. How many 5 digit numbers can be formed using the digits 0,2,5,6,7 with...

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  12. Show that ,((1+i)/(1-i))^2+((1-i)/(1+i))^2is a real number.

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  13. Find the distance between the lines 3x+4y=9 and 6x+8y+15=0.

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  14. Find the value of :lim(xrarr0)(sin2x+sin6x)/(sin5x-sin3x)

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  15. In an examination 60% passed in mathematics,68% passes in statistics a...

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  16. If alpha!=betaand atanalpha+b tanbeta=(a+b)tan((alpha+beta)/2),then sh...

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  17. For any three sets A,Band C show that :Acap(BcupC)=(AcapB)cup(AcapC)

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  18. Prove using principle of mathematical induction that sum of the cube t...

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  19. If w be a imaginary cube root of uniyt and a+b+c=0 then show that (a+b...

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  20. Find the sum upto n terms of the following series 4+44+444+….n.

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