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Question

Which term of the AP 18, 23, 28, 33, ……. is 98?

A
15th
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B
16th
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C
17th
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D
18th
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Solution

The correct option is C 17th
Given, series is 18, 23, 33, ........
an=a+(n1)d
Here, 1st term (a) = 18,
common difference (d) = 23-18 = 5
and an=98
98=18+(n1)59818=(n1)5805=n1n=17

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