What should come in place of '?' in the given series? 217 190 165 142 121 102 ?
85
Find the differences between consecutive terms. 217 - 190 = 27, 190 - 165 = 25, 165 - 142 = 23, 142 - 121 = 21, 121 - 102 = 19.
The differences are 27, 25, 23, 21, 19, decreasing by 2 each time. The next difference is 17.
So the next term is 102 - 17 = 85.
Hence, the missing number is 85.
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