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Quantitative Aptitude

Divisibility Rule for Composite Numbers

The fourth an...

Question

The fourth and sixteenth term of an A.P are 4 and 23 respectively. Then the tenth term of the A.P. is

A

13

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B

16

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C

17

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D

13.5

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Solution

The correct option is D
13.5

Let a and d be the first term and common difference of the A.P.

a + 3d = 4

a + 15 d =23

Adding both the equations we get 2a + 18d = 27

a + 9d = 13.5

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