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There are n necklaces such that the firs...

There are n necklaces such that the first necklace contains 5 beads, the second contains 7 beads and, in general the ith necklace contains i beads more than the number of beads in (i-1)th necklace. Find the total number of beads is all the n necklaces.

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MOTION-SEQUENCE & SERIES -Exercise -4 Level -II Previous Year /JEE Advanced
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  3. Let Vr denote the sum of the first r terms of an arithmetic progressio...

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  4. Let Vr denote the sum of the first r terms of an arithmetic progressio...

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  5. Let A1 , G1, H1denote the arithmetic, geometric and harmonic means re...

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  6. Let A1 , G1, H1denote the arithmetic, geometric and harmonic means re...

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  7. Let A1 , G1, H1denote the arithmetic, geometric and harmonic means re...

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  9. Suppose four distinct positive numbers a1,a2,a3,a4 are in G.P. Let b1=...

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  14. Let a1, a2, a3, ,a(100) be an arithmetic progression with a1=3a n dsp...

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  15. If a(1),a(2),a(3),"......" be in harmonic progression with a(1)=5 and ...

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  16. Let a(n) denote the number of all n-digit numbers formed by the digits...

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  17. Let an denote the number of all n-digit positive integers formed by th...

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  18. Let S(n)=sum(k=1)^(4n)(-1)^((k(k+1))/2)k^(2). Then S(n) can take value...

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