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Check 2,4,6,8,10 are in A.P or not...

Check `2,4,6,8,10` are in `A.P` or not

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The correct Answer is:
A
Till 10th minute, number of counted notes =1500
`:. 3000=(n)/(2){2xx148+(n-1)xx-2}=n(148-n+1)`
`implies n^(2)-149n+3000=0`
`implies (n-125)(n-24)=0`
`:.n=125,24`
`n=125` is not possible.
`:.` n=24`
`:. " Total time =10+24=34 min`.
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ARIHANT MATHS-SEQUENCES AND SERIES-Exercise (Questions Asked In Previous 13 Years Exam)
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  2. Let a1, a2, a3, ,a(11) be real numbers satisfying a1=15 , 27-2a2>0 an...

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  3. Check 2,4,6,8,10 are in A.P or not

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  4. The minimum value of the sum of real numbers a^-5, a^-4, 3a^-3, 1,a^8 ...

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  5. A man saves ₹ 200 in each of the first three months of his servies.In ...

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  6. Let a(n) be the nth term of an AP, if sum(r=1)^(100)a(2r)= alpha " and...

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  7. Let,a1,a2a,a3,…. be in harmonic progression with a1=5 " and " a(20)=25...

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  8. Statement 1: The sum of the series 1""+""(1""+""2""+""4)""+""(4""+""...

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  9. If 100 times the 100 th term of an A.P with non- zero common differenc...

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  10. If x,y,z are in AP and tan^(-1)x,tan^(-1)y,tan^(-1)z are also in AP, ...

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  11. The sum of first 20 terms of the sequence 0.7 ,0.77 , 0.777 …., is

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  12. Let Sn=underset(k=1)overset(4n)Sigma (-1)^((k(k+1))/2)k^2.Then Sn can ...

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  13. A pack contains n cards numbered from 1 to n . Two consecutive numbere...

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  14. If (10)^9+2(11)^1(10)^8 +….+10 (11)^9 = k(10)^9

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  15. Three positive numbers form an increasing GP. If the middle terms in t...

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  16. find the 3rd term in the sequence: an =(-1)n+15n+1

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  17. The sum of first 9 terms of the series (1^(3))/(1)+(1^(3)+2^(3))/(1+3)...

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  18. If m is the A.M. of two distinct real numbers l and n""(""l ,""n"">"...

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  19. Soppose that all the terms of an arithmetic progression (AP) are natur...

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  20. If the 2nd , 5th and 9th terms of a non-constant A.P are in G.P then t...

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