1+3+5+7+9+11+13+15+17+19=100 hota hai.ab batao in me se koun se 5 number hai jisko total krne par 50 banege.?

It is a trick question. You provided of ten numbers and all of them are odd number. . If you add odd numbers even number of times then result will be an even number (1+ 3=4 here total terms is 2 which is an even number so result is an even number). If you add odd numbers, odd numbers of time then answer will be a odd number (1+3+5=9 here 3 terms and result is odd). You give me 10 odd numbers whose sun is 100(here even terms and answer is even) . You want 5 numbers whose sum is 50. So it is not possible because you want to add odd number of terms to get an even number. So no combination is possible from provided number whose sum is 50.