In this type of questions some problematic situations are provided you have to analyise the situation and give the logical correct solution for the problem. Find the missing number in the series: 9, 7, 4, 2, ?
-1
Find the differences between consecutive terms.
9 – 7 = 2, 7 – 4 = 3, 4 – 2 = 2.
So the terms decrease by 2 and 3 alternately: –2, –3, –2, and the next step is –3.
Next term = 2 – 3 = –1.
Check: alternate terms 9, 4, –1 each fall by 5, and 7, 2 also fall by 5, so the pattern is consistent.
Hence, -1.
Similar Questions
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Important Questions from Number Series
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A series is given with one term wrong. Select that wrong term from the given alternatives.
J12, M24, P48, S96, U192
