Question

if the unit digit in the product 75?*49*867*943 be 1,then the value of ? is what? what is the calculation of it?!

Answer 1

49*867*943=40,061,469

750*that=30,046,101, 750

751*that=30,086,163, 219

752*that=30,126,224,688

753*that=30,166,286,157

754*that=30,206,347,626

755*that=30,246,409,095

756*that=30,286,470,564

757*that=30,326,532,033

758*that=30,366,593,502

759*that=30,406,654,971