The given number series is 9 7 10 6 11 ?
Here in this we have two number sequences, they are
9, 10, 11, ... and 7, 6, 5, ...
Hence, the next number in the given number series is 6 - 1 = 5.
The given number series is 21 56 102 160 231 316
21 56 102 160 231 316 416
+35 +46 +58 +71 +85 +100
+11 +12 +13 +14 +15
Hence, the next number in the given number series is 316 + 100 = 416.
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