NIMCET 2012 — Mathematics PYQ
NIMCET | Mathematics | 2012The sum of 20C8+20C9+21C10+22C11−23C11 is:
Choose the correct answer:
- A.
22C12
- B.
23C12
- C.
0
0
Explanation
calculation:
1. Combine the first two terms:
20C8+20C9=21C9
2. Add the result to the third term:
21C9+21C10=22C10
3. Add the result to the fourth term:
22C10+22C11=23C11
4. Final subtraction:
Now, we subtract the last term given in the expression:
23C11−23C11=0
Conclusion:
The final result of the sum is 0.
Correct Option:
(c) 0
Explanation
calculation:
1. Combine the first two terms:
20C8+20C9=21C9
2. Add the result to the third term:
21C9+21C10=22C10
3. Add the result to the fourth term:
22C10+22C11=23C11
4. Final subtraction:
Now, we subtract the last term given in the expression:
23C11−23C11=0
Conclusion:
The final result of the sum is 0.
Correct Option:
(c) 0