1.The number of ways of choosing 10 objects out of 31 objects of which 10 are identical and the remaining 21 are distinct, is:a.2202^{20}220b.2212^{21}221c.220+12^{20} + 1220+1d.220−12^{20} - 1220−1Login to continueOnly logged in users canattempt or see the solution.
