Easy
From a class of $25$ students,$10$ are to be chosen for an excursion party. There are $3$ students who decide that either all of them will join or none of them will join. In how many ways can the excursion party be chosen?
- A$^{22}C_{7} + ^{22}C_{10}$
- B$^{22}C_{7} + ^{22}C_{9}$
- C$^{22}C_{8} + ^{22}C_{10}$
- D$^{22}C_{7} + ^{22}C_{11}$
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View Solution$^{20}C_1 + 3 ^{20}C_2 + 3 ^{20}C_3 + ^{20}C_4$ is equal to-
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