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If a,b,c are the sides of a triangle and...

If a,b,c are the sides of a triangle and `s=(a+b+c)/2` , prove that `8(s-a)(s-b)(s-c)leabc`.

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PATHFINDER-PROGRESSION AND SERIES -QUESTION BANK
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  2. If a,b,c are positive real no., then prove that [(1+a)(1+b)(1+c)]^7 g...

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  3. If a,b,c are the sides of a triangle and s=(a+b+c)/2 , prove that 8(s-...

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  4. Prove that a^4+b^4+c^4>abc(a+b+c). [a,b,c are distinct positive real n...

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  5. Show that the greatest value of xyz(d-ax-by-cz) is d^4/(4^4abc).

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  6. Prove that ((a+b)/2)^(a+b) le a^a.b^b.[a,binN].

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  7. N arithmetic means are inserted in between x and 2y and then between 2...

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  8. Let Sn denote the sum upto n terms of an AP . If Sn=n^2P and Sm=m^2P ...

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  9. If s1 ,s2 and s3 are the sum of first n,2n,3n terms respectively of an...

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  10. Let a1,a2 ,a3 ...... be an A.P. Prove that sum(n=1)^(2m)(-1)^(n-1)an^2...

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  11. A G.P. consists of 2n terms . If the sum of the terms occupying the od...

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  12. If G1 ,G2 are geometric means , and A is the arithmetic mean between ...

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  13. Show that abs((a,b,aalpha+b),(b,c,balpha+c),(aalpha+b,balpha+c,0):}=0 ...

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  14. If Sn=1+1/2+1/2^2+........+1/2^(n-1) . Calculate the least value of n ...

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  15. Prove that the number of the sequence 121,12321,1234321,...... are eac...

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  16. Find the sum of n terms of series 1+5((4n+1)/(4n-3))+9((4n+1)/(4n-3))^...

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  17. Find the sum of the products of the integers 1,2,3,....n taken two at ...

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  18. Sum the series n+(n-1)x+(n-2)x^2+.......+2x^(n-2)+x^(n-1).

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  19. Find 1+2^2x+3^2x^2+4^2x^3+.... to infty absx lt 1.

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  20. Find the sum of 1st n terms of the sequence 3,6,15,42,123,...

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