10. From a class of 25 students, 10 are to be chosen for an excursion party. There are 3 students

[@keshavsanadhya8530]

but, sir , jab join karna tha tab to 10-3=7 kar diya es time to 22c3 hona chaiye tha or jab join hi nhi kar rhe the tab 7 hona chaiye tha , esa kyun ho rha hai