What is the value of : `C_3^20 + C_4^20 + C_5^20 + ..........+ C_17^20` ?

What is the value of C_p//C_v for oxygen ?

What is C - value paradox ?

Write the value of intx^20sec^2x dx-intx^20tan^2x dx .

What is the value of : |[4,a,b+c ],[4,b,c+a],[4,c,a+b]|

Given that standard heat enthalpy of CH_4, C_2 H_4 and C_3H_8 are -17.9, 12.5, -24.8 kcal/mol. The triangleH for CH_4+C_2H_4rarrC_3H_8 is:

A steel rod when measured with a zinc scale (alpha = 26 xx 10^(-6)//^@C) appears to be 1 m long when both rods are at 20^@C . If the zinc scale was graduated at 0^@C , what is the true length of the steel rod at 0^@C ? alpha for steel = 12 xx 10^(-6)//^@C .

Distinguish between C_3 and C_4 plants