Evaluate : `^25C_22-^24C_21`

Evaluate the following : "^25C_22- ^24C_21 .

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

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)

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

Evaluate A=|(2,-3,-5),(6,0,4),(1,5,-7)| Also find minor and cofactor of elements in the 2nd row of determinant and verify -a_21C_21+a_22C_22+a_23C_23=value of A where C_21,C_22,C_23 are cofactors of a_21,a_22,a_23