Evaluate : `^25C_22-^24C_21`

Evaluate: .^(20)C_(5)+^(20)C_(4)+^(21)C_(4)+^(22)C_(4)

""^(25)C_(22)- ""^(24)C_(21)= …………

25. The value of (21_C_1- 10_C_1) +(21_C_2- 10_C_2)+ (21_C_3- 10_C_3) +...............+(21_C_10- 10_C_10)

25. The value of (21_C_1- 10_C_1) +(21_C_2- 10_C_2)+ (21_C_3- 10_C_3) +...............+(21_C_10- 10_C_10)

Find the value of -^(22)C_(16)+^(22)C_(15)

Prove that : ""^(25)C_(10)+""^(24)C_(10)+……..+""^(10)C_(10)=""^(26)C_(11)

If .^25 C_0 + 5 .^25 C_1 + 9 .^25 C_2 .... 101 .^25 C_25 = 2^(25) k find k = ?

The sum of ""^21C_0+""^21C_1+""^21C_2+...+""^21C_10 is equal to ______.