Eamcet - Maths - Sequences And Series

1.4+2.5+3.6+….n(n+3)=

A.  n(n+1)(n+5)/3

B.  n(n+1)(n+2)/3

C.  n(4n2+6n-1)/3

D.  n(n+1)(n+2)

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A= 20th term of 1.2+2.3+3.4+…. B=15th term of 1.3+3.5+5.7+… C=10th term of 1.22+2.32+3.42+… D=10th term of 2.12+3.22+4.32+…. Then the increasing order of A, B, C, D is

A.  A, B, C, D

B.  A, C, D, B

C.  A, B, D, C

D.  A,D, B, C

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1.22+2.32+3.4+….+n(n+1)2=

A.  n(n+1)(n+2)(3n+5)/12

B.  n(n+1)(n+2)(n+3)/4

C.  2n(n+1)(n+2)(n+3)

D.  n(n+1)(n+2)(3n+1)/12

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