Question 27

In the following series, one number is missing as shown by the question mark (?). Select the missing number from the given options.
8, 12, 16, 20, ?

Solution

This is an arithmetic sequence since there is a common difference between each term. In this case, adding to the previous term in the sequence gives the next term

$$a_n = a_1 + (n-1) \times d$$

Substitute in the values of $a_{1} = 8$ , $d = 4 and n=5$

an=8+(4)(n−1)

$$=8-4+4n$$

$$4+4n$$

$$4+4\times5$$

$$24$$

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RRB ALP 13th Aug 2018 Shift-2

In the following series, one number is missing as shown by the question mark (?). Select the missing number from the given options.8, 12, 16, 20, ?

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In the following series, one number is missing as shown by the question mark (?). Select the missing number from the given options.
8, 12, 16, 20, ?