# If n is even then C02-C12+C22-……….+(-1)n Cn2 =

1.  0

2.  nC(n/2)(-1)n/2

3.  2nCn(-1)n

4.  (2n+1)Cn(-1)n

4

nC(n/2)(-1)n/2

Explanation :
No Explanation available for this question

# (2n+1)C0-(2n+1)C1+…………. -(2n+1)C2n =

1.  -1

2.  1

3.  2

4.  -2

4

1

Explanation :
No Explanation available for this question

# The coplanar points(1,2,2), (2,-1,0),(1,1,3),(0,4,5) form a

1.  parallelogram

2.  rectangle

3.  square

4.  rhombus

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rhombus

Explanation :
No Explanation available for this question

# (2nC0)2-(2nC1)2+(2nC2)2-…………..+(2nC2n)2 =

1.  (-1)n  2nCn

2.  (-1)n  (2n+1)Cn

3.  (-1)(n-1)  2nCn

4.  (-1)(n-1)  2nCn+1

4

(-1)n  2nCn

Explanation :
No Explanation available for this question

# C1/1 – C2/2 + C3/3 – C4/4 +………. +(-1)n-1 Cn/n =

1.  1+1/2+1/3+....1/n

2.  1+1/2-1/3+....1/n

3.  1+2/3+3/4+....n/n+1

4.  none

4

1+1/2+1/3+....1/n

Explanation :
No Explanation available for this question

# C0 – 22.C1+32.C2 - …………. +(-1)n(n+1)2.Cn =

1.  0

2.  2n

3.  2n+1-1/n+1

4.   none

4

0

Explanation :
No Explanation available for this question

# mCr+ mCr-1nC1+mCr-2. nC2+………..+ nCr =

1.  (m+n)Cr

2.  (mn)Cr

3.  (m+n)Cr+1

4.  (m+n)Cr-1

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(m+n)Cr

Explanation :
No Explanation available for this question

# C1-C2+C5-C7+……….

1.  2n-1

2.  2n/2 sin

3.  2n/2 cos

4.  0

4

2n/2 sin

Explanation :
No Explanation available for this question

# If x+y=1, then .nCrxr.yn-r =

1.  1

2.  n

3.  nx

4.  ny

4

n

Explanation :
No Explanation available for this question

1.  nxy

2.  nx(x+yn)

3.  nx(nx+y)

4.  none

4