When is Income Tax Day celebrated in India?

In which icy and mountainous area has DRDO started to test Kovid-19?

When is the foundation day of CRPF celebrated?

If a+b+c=15 and a²+b²+c²=83 then the value of a³+b³+c³-3abc

If x = a - b, y = b - c, z = c - a, then the numerical value of the algebraic expression x³ +y³ + z³ -3xyz will be 

If a=34, b=c=33, then the value of a3+b3+c3-3abc is 

If a+b = 1 and a³+b³+3ab=k, then the value of k is : 

If $$64^{x+1}={64\over 4^x}$$, then the value of x