What should come in place of the question mark (?) in the given series? 170 150 133 119 108 ?
100
Find the differences between consecutive terms: 170 − 150 = 20, 150 − 133 = 17, 133 − 119 = 14, 119 − 108 = 11.
These differences themselves decrease by 3 each time: 20, 17, 14, 11, so the next difference is 11 − 3 = 8.
Subtract this from the last term: 108 − 8 = 100.
Hence, the number that should come in place of the question mark is 100.
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Important Questions from Series
Choose the option which completes the given figure series.
Select the correct option that will fill in the blank and complete the series.
18, 36, 108, 432, 2160, .............Select the correct option that will fill in the blank and complete the series.
52, 56, 65, 81, 106, ?Select the correct option that will fill in the blank and complete the series. 21, 43, 85, 171, 341, .......
Select the correct option that will fill in the blank and complete the series.
3, 5, 7, 9, 11, ?
2, 2, 2, 2, 2, ?
