# NIELIT 2016 MAR Scientist D: 52

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Choose the most appropriate option.

$4, 7, 25, 10, \underset{\text{_____}}{?}, 20, 16, 19$

1. $13$
2. $15$
3. $20$
4. $28$

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1 vote
Two series alternate here, with every third number following a different pattern.

In the main series, $3$ is added to each number to arrive at the next.

In the alternating series 5 is subtracted from each number to arrive at the next.

$4,7,10,13,16,19$ is one series.

$25,20$ is another series.

so missing number is $13$

Option $A$ is correct.
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