What is the next number of the following sequence ? 21, 77, 165, 285, ......

Mental Ability - Questions

437

426

415

401

Correct Answer : Option (A) - 437

Explanation :

The series follow the rule :

21 = 5²-4

77 = 9²−4

165 = 13²−4

285 = 17²−4

5,9,13,17,21,(+4)...

In the same way next no. will be

21²−4 = 441 - 4 = 437

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Q .

In the following question :

Various terms of an alphanumerical series are given with one or more terms missing as shown by (?).

Choose the missing terms out of the given alternatives. BMO, EOQ, HQS, ?

SOV

LMN

KSU

SOW

Correct Answer : KSU

Explanation : The first letter moves 3 steps forward. The second and third letters move 2 steps forward.

Q .

What should come in place of the question mark (?) in the following number series? 8, 6, 9, 23, ?

Correct Answer : 87

Explanation :

Given number 8, 6, 9, 23, ?

The pattern of given series is :

8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x3 - 4 = 23 23 x4 - 5 = 87