1.

Find the missing number5, 25, 61, 113, 181? (1) 265 (2) 375 (3) 275 (4) 365

Answer»

(1) 265

5, 25, 61, 113, 181? 

\/  V  V  V 

20 36  52 16

∴ 68  16 = 81

181 + 84 = 265

∴ 265



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