Select the correct option that will complete the series. (3, 5), (5, 10), (7, 15), ?, (13, 25)
(9, 20)
Every element here is an ordered pair, so the cleanest strategy is to separate the pairs into two lists, one built from the first entries and one from the second entries, and study each list on its own.
Take the first numbers in order: 3, 5, 7, ?, 13. From 3 to 5 to 7 the step is a constant increase of 2, so these are consecutive odd numbers.
Continuing that step of 2, the number after 7 is \(7+2=9\), and the following listed value 13 fits the chain 9, 11, 13 perfectly.
Now take the second numbers in order: 5, 10, 15, ?, 25. Here each term is 5 more than the one before, a constant step of 5.
The value after 15 is \(15+5=20\), and it is correctly followed by \(20+5=25\), matching the final pair.
Recombining the two recovered values, first entry 9 and second entry 20, gives the missing pair (9, 20). This slots neatly between (7, 15) and (13, 25).
Hence the pair that completes the series is (9, 20).
Similar Questions
What will be the 50th term in the following series?
20, 24, 28, 32, ....
A series is given with one term wrong. Select the wrong term from the given alternatives.
-913, -916, -924, -937, -955, -975, -1006, -1039
A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
11, 36, 147, ? , 1779, 5340, 21363
In the following question, four number pairs are given. In each pair the number on left side of (−) is related to the number of the right side of (−) with some Logic/Rule/Relation. Three pairs are similar on the basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.
(NOTE: Operations should be performed on the whole numbers, without breaking down the number into its constituent digits. E.g.13 − Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)
Find the next element that replace the ? Logically
990, 1321, 1718, 2187, ?
Directions: Pick the correct options from below.
8, 18, 32, 50, ?
Identify the next number in the sequence.
8, 24, 48, 80, 120, ?
Which of the following numbers would replace the question mark (?) in the given number series?
11, 14, 19, 26, 35, ?
Find the next element that replace the ? Logically
90, 109, 130, 153, ?
Find the next element that replace the ? Logically
30, 41, 54, 69, ?
Important Questions from Number Based
In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.
Select the set in which the numbers are related in the same way as are the number of the following set.
(3, 7, 58)
Find the odd number/letters from the given alternatives.
Find the odd number/letters from the given alternatives.
Identify the number which is different from the other.
