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Common Difference

18th term of ...

Question

$18^{t h}$ term of the AP 1,7,13,19 .... is ________`

A

102

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B

18

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C

103

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D

19

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Solution

The correct option is B 103
$A P$ is $1, 7, 13, 19, . . . . . .$
$a = 1 d = 6$
$t_{18} = a + 17 d = 1 + 17 \times 6 = 1 + 102 = 103$

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