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A person is to count 4500 currency notes...

A person is to count 4500 currency notes. Let `a_n` denote the number of notes he counts is the `n^(th)` minute .If `a_1=a_2` =…… `=a_10`= 150 and `a_10,a_11..,` are in A.P with common difference -2, then the time to count all notes

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A person is to count 4500 currency notes. Let a_n , denote the number of notes he counts in the nth minute if a_1=a_2=a_3=..........=a_10=150 and a_10,a_11,......... are in an AP with common difference -2 , then the time taken by him to count all notes is :- (1) 24 minutes 10 11 (2) 34 minutes (3) 125 minutes (4) 135 minutes

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AAKASH INSTITUTE ENGLISH-SEQUENCES AND SERIES -Try Yourself
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  7. If (x^p+y^p)/(x^(p-1)+y^(p-1))=(x+y)/2 be the A.M. between x and y the...

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  10. If A1,A2,A3, A4 and A5 are the five A.M.'s between 2 nd 8, then find t...

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  11. Find the sequence whose n^(th) term is 5^(n-1) it a G.P. ? Find it...

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  12. Find the sequence whose n^(th) term is 5^(n) - 1 is it a G.P. ? Wh...

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  13. Find the n^(th) term of the G.P. (3)/(2), (3)/(4), (3)/(8),…. also fi...

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  14. Which term of the progression 0.004,0.02,0.1,… is 12.5?

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  15. If 5th nd 8th of a G.P. be 48 and 384 respectively. Findteh G.P. if te...

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  16. If the (p+q)^(th) term of a G.P. is a and (p-q)^(th) term is b, determ...

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  17. In any G.P. , prove that a(n-p) xxa(n+p) = (a(n))^(2) .

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  18. If a be the first term, l the nth and p the product of first n terms ...

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  19. Find the three numbers in G.P. whose sum is 93 and whose product is 3...

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  20. Find the three numbers in G.P. whose sum is 38 and whose product is 17...

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