Logical Reasoning :: Number Series - Discussion
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Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
A20
B25
C30
D50
Answer: Option (Login/Signup)
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here 1,3,5............... terms are decreasing by 10
and 2,4,6,8................ are being increased by 5
so 6th term = 15 5=20;
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STEP-BY-STEP
here 1,3,5............... terms are decreasing by 10
and 2,4,6,8................ are being increased by 5
so 6th term = 15 5=20;
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SHORTCUT
starting from the first number, every alternate number is formed by Reducing 10. And from the second number, every alternate number increases by 5.
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STEP-BY-STEP
there is alternate series going on, starting decending order from 80 in difference of 10.
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