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madhur gupta

· started a discussion

· 1 Months ago

Explain (Question:388278.0)

Please explain

Question:

A person is to count 4500 notes. Let an denote the number of notes he counts in the nth minute. If a1 = a2 = a3 ...........= a10   = 150 and a10, a11, a12..... are in A.P. with the common difference –2, then the time taken by him to count all the notes is –  

Options:
A)

24 min

B)

34 min

C)

125 min

D)

135 min

Solution:

Ans: (b)

  

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