find the different31:69::351:
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The above series is formed by,
23 + 3, 33 + 4, 43 + 5, 53 + 6 and 63 + 7.
i.e., 8 + 3 = 11
27 + 4 = 31
64 + 5 = 69,
125 + 6 = 131
216 + 7 = 223
Therefore the next number is: 73 + 8 = 343 + 8 = 351.
Hence the required answer is 351.
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