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Sequences and Series question

2010 · Shift 0 · Q44

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JEE Main
Mathematics
Sequences and Series
2010 · Shift 0 · Q44

Sequences and Series question

2010 · Shift 0 · Q44

JEE MainMathematicsSequences and SeriesMCQ+4 / −1

A person is to count 4500 currency notes. Let

{a_n}

denote the number of notes he counts in the

{n^{th}}

minute. If

{a_1}

=

{a_2}

= ....=

{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

A
34 minutes
B
125 minutes
C
135 minutes
D
24 minutes

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