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Q.

r=13r2+r+5r!=

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a

12e

b

12e – 4

c

12e – 5

d

12e – 3

answer is D.

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Detailed Solution

  r=1 3r2+r+5r  r=1 3.rr-1+1r-1+5r =3 r=1 (r-1)+1r-1+e+5(e-1) =3 r=1 1r-2+1r-1+6e-5 =3(e+e)+6e-5 =12e-5

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