13 votes 13 votes The next term in the series $81, 54, 36, 24,\dots $ is_________. Quantitative Aptitude gate2014-ec-3 number-series quantitative-aptitude numerical-answers + – makhdoom ghaya asked Mar 8, 2016 makhdoom ghaya 3.5k views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Naveen Kumar 3 commented Nov 20, 2018 reply Follow Share I'm getting 15 by taking successive difference & forming its series. 2 votes 2 votes Shubhm commented Nov 25, 2019 reply Follow Share https://www.quora.com/What-is-the-next-number-in-the-series-81-54-36-24 0 votes 0 votes Please log in or register to add a comment.
Best answer 16 votes 16 votes We get next term in sequence by $\left(\dfrac{X}{3}\right)\times 2$ $\dfrac{81}{3} =27\times 2 = 54$ $\dfrac{54}{3} =18\times 2 =36$ $\dfrac{36}{3} =12\times 2 = 24$ $\dfrac{24}{3} = 8\times 2 = 16$ Answer)16 abhilashpanicker29 answered Mar 8, 2016 • edited Dec 6, 2017 by pavan singh abhilashpanicker29 comment Share Follow See all 3 Comments See all 3 3 Comments reply Rupendra Choudhary commented Jan 25, 2018 reply Follow Share below arrangement is supporting 15 as another possible answer? am i wrong? 81 54 36 24 15 3*27 3*18 3*12 3*8 3*5 27-18=9 18-12=6 12-8=4 8-5=3 9-6=3 6-4=2 4-3=1 4 votes 4 votes MiNiPanda commented Nov 20, 2018 reply Follow Share @Rupendra Choudhary, Yes I approached it in the same way. 2 votes 2 votes Pranavpurkar commented Jan 23, 2023 reply Follow Share 9 is also a possible answer, series given → 81 , 54 ,36 , 24 difference between first two terms( 81 – 54 = 27) then (54 – 36 = 18) then (36 – 24 = 12) see 27 = 3 * 9 18 = 3 * 6 12 = 3 * 4 now take 9 , 6 , 4 difference between first two (9 – 6 = 3) then (6 – 4 = 2) so whats the next term? it will be 1 right? so means missing term will be 3 *3. please check if anything is incorrect! not sure about this ! 0 votes 0 votes Please log in or register to add a comment.
9 votes 9 votes ALTERNATE LOGIC (Look at the number of 2's) $ 81 = 3 \times 3 \times 3 \times 3 $ $ 54 = 3 \times 3 \times 3 \times$$ 2 $ $ 36 = 3 \times 3 \times$$ 2 \times 2 $ $24= 3 \times$$ 2 \times 2 \times 2 $ $16=$ $2 \times 2 \times 2 \times 2 $ vaibhav101 answered Feb 1, 2018 • edited Jan 31, 2019 by Lakshman Bhaiya vaibhav101 comment Share Follow See all 3 Comments See all 3 3 Comments reply saumya mishra commented Jun 22, 2018 reply Follow Share I am also getting 15 as the answer. 0 votes 0 votes saumya mishra commented Jun 22, 2018 reply Follow Share What is the correct answer??15 or 16 0 votes 0 votes meghna commented Nov 25, 2018 reply Follow Share its 24=3*2*2*2 12=2*2*2*2=16 0 votes 0 votes Please log in or register to add a comment.
2 votes 2 votes $81,54,36,24,$______ $\dfrac{81}{1.5} = 54$ $\dfrac{54}{1.5} = 36$ $\dfrac{36}{1.5} = 24$ $\dfrac{24}{1.5} = 16$ So, the correct answer is $16.$ Lakshman Bhaiya answered Feb 5, 2020 Lakshman Bhaiya comment Share Follow See 1 comment See all 1 1 comment reply ankit3009 commented Jan 25, 2021 reply Follow Share Sir, you get these series assumption by intuition itself or there’s some trick or concept behind it? 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes By successive subtraction, I’m getting 15 as answer. rish1602 answered May 29, 2021 rish1602 comment Share Follow See all 0 reply Please log in or register to add a comment.