Product

Product[expr, n] returns the product of n copies of expr.

Product[expr, {sym, n}] returns the product of expr evaluated with sym = 1 to n.

Product[expr, {sym, m, n}] returns the product of expr evaluated with sym = m to n.

Attributes[Product] := {HoldAll, Protected, ReadProtected}

Simple examples

In[1]:= Product[a, {a, 1, 5}]
Out[1]= 120

In[2]:= Product[f[a], {a, 1, 5}]
Out[2]= f[1]*f[2]*f[3]*f[4]*f[5]

In[3]:= Product[a^2, {a, 4}]
Out[3]= 576

In[4]:= Product[a + b, {a, 1, 2}, {b, 1, 3}]
Out[4]= 1440