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The 4th trem of an Ap …

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The 4th trem of an Ap is zeors .prove that 25th term of the APis three times its 11th term
  • 1 answers

Ravi Kumar 6 years, 6 months ago

a4=0 a+(4-1)d=0 a+3d=0 ....(1) We need to prove that a25=3×a11 i.e, a+24d = 3(a+10d) Proof: a+24d. =3(a+10d) a+3d+21d =3(a+3d+7d) (a+3d)+21d =3{(a+3d)+7d} 0+21d =3{0+7d} ....Using(1) 21d =21d L.H.S = R.H.S
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