# Verbal Reasoning - Series Completion - Discussion

### Discussion :: Series Completion - Section 1 (Q.No.5)

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

5.

125,80,45,20,?

 [A]. 5 [B]. 8 [C]. 10 [D]. 12

Explanation:

The pattern is - 45, - 35, - 25, .....

So, missing term = 20 - 15 = 5.

 Krishna Kumar said: (May 10, 2011) Another method : 5*5^2 => 5*25=125 5*4^2 => 5*16=80 5*3^2 => 5*9=45 5*2^2 => 5*4=20 so the next term would be... 5*1^2 => 5*1=5 Hence the next term is obtained as 5.

 Sigamani said: (Jun 13, 2011) Sigamani, It is a very and easy calcuation method, Thank you.

 Vishnu said: (Jul 8, 2011) Very simple method: Difference between 125-80=45 80-45=35 45-20=25 so 20-15=5

 Nishritha said: (Aug 16, 2011) All are divisible by 5 125/5=25 80/5=16 45/5=9 20/5=4 25-16=9 9-4=5 5 is the answer

 Divya said: (Sep 14, 2011) Thank you Vishnu. It is very easy calculation method.

 Naro said: (Jun 28, 2012) 25*5=125. 20*4=80. 15*3=45. 10*2=20. 5*1=5. First number is decreasing by 5 and second number is decreasing by 1.

 Sai Ram said: (Jun 30, 2012) Here alternatives 125-45 = 80. 80-20 = 60. So 45-40 = 5.

 Deepak said: (Jul 17, 2013) 5*5*5=125. 4*4*5=80. 3*3*5=45. 2*2*5=20. 1*1*5=5.

 Ankit Mahale said: (Jun 24, 2014) 5*5^2 = 125. 5*4^2 = 80. 5*3^2 = 45. 5*2^2 = 20. 5*1^2 = 5.

 B.Manikanta said: (Aug 23, 2014) 125/5, 80/5, 45/5, 20/5, (5/5). 25, 16, 9, 4, 1. 5, 4, 3, 2, 1. So, the answer is 5.

 Srinu said: (Jun 18, 2015) Thanks for all.

 Mayank said: (Jun 26, 2015) Here, 125-80=45. 80-45=35. 35-20=15. 20-15=5. All of the no are difference between the only for 10 after 10.

 Edddd said: (Jul 28, 2015) Select the option for that continues the pattern in each question 3, -6, 12, 4, 20?

 Nrusingha said: (Jan 21, 2016) Some one already told this method above, & is a short cut, 25*5 --> 5^2 * 5. 16*5 --> 4^2 * 5. 9*5 --> 3^2 * 5. 4*5 --> 2^2 * 5. 1*5 --> 1^2 * 5 (answer). Remaining methods are boring to me.

 Mozako said: (Jun 28, 2018) 10^2 + 5^2 = 125. 8^2 + 4^2 = 80. 6^2 + 3^2 = 45. 4^2 + 2^2 = 20. 2^2 + 1^2 = 5.

 Divya said: (Sep 1, 2020) 125 - 80 = 45, 80 - 45 = 35, 45 - 20 = 25. So the next difference should be of 15. 20-15 = 5 answer.

 Khapa said: (May 26, 2021) According to me, It's; 125-45 = 80 80-35 = 45 45-25 = 20 20-15 = 5. So, 5 is the answer.