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Question

The first negetive term in the sequence of 56,5515,5425,

A
71th
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B
70th
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C
72th
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D
73th
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Solution

The correct option is C 72th
56,5515,5425,
=2805,2765,2725,...
Hence, the given sequence is in AP with common difference d=45
To find the first negative term, Tn<0
a+(n1)d<0
56+(n1)(45)<0
2804n+4<0
4n>284
n>71
Hence, first negative term is 72th.


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