15,12,17,10,?,8,25 find the missing no
Answers
20 is the missing number in the series 15, 12, 17, 10, ?, 8, 25
Given:
15, 12, 17, 10, ?, 8, 25
To find:
Missing term = ?
Solution:
In the given series 15, 12, 17, 10, ?, 8, 25 there are two series working one is in ascending order and the other one is in descending order .
One of the series is 12, 10, 8 which is in decreasing order. The difference between the numbers is 2 and all components are given while The other series is 15, 17, ?, 25 this is in ascending order and the number is missing from this series, the difference in number 17 - 15 = 2 ( two is even number and a prime number so the difference with next number will also be even or prime)
Trying prime number next prime numbers are 3 and 5
17 + 3 = 20 ; 20 + 5 = 25
Hence this number 20 satisfies the equation.
20 is the missing number in the given series.
Answer:
Missing number = 19
Step-by-step explanation:
The sequence may be like this 15, 12 , 17, 10,?, 8,21
Here we have two different sequence, they are
15,17,19,21
Therefore,
missing number = 19
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