Mathematical an...

Choose or find odd number:
$$3740,4635,5869,7946,2378$$

Choose or find odd number:
$$5698,4321,7963,4232,8597$$

Find the wrong number in the series :
7, 28, 63, 124, 215, 342, 511

Choose or find odd number:
$$35,49,50,63,140$$

Choose or find odd number:
$$5698,7894,9865,8793,6958$$

Choose or find odd number:
$$263,111,242,551,383$$

Choose or find odd number:
$$7487,5963,8218,6596,9259$$

Choose or find odd number:
$$2384,1592,3756,4298,3629$$

Choose or find odd number:
$$7359,1593,9175,3781,9317$$

Choose or find odd number:
$$21,69,81,83$$