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Count

 Count[list, pattern]gives the number of elements in list that match pattern. Count[expr, pattern, levelspec]gives the total number of subexpressions matching pattern that appear at the levels in expr specified by levelspec.
• Count uses standard level specifications:
 n levels 1 through n Infinity levels 1 through Infinity {n} level n only {n1,n2} levels n1 through n2
• The default value for levelspec in Count is {1}.
• A positive level n consists of all parts of expr specified by n indices.
• A negative level -n consists of all parts of expr with depth n.
• Level -1 consists of numbers, symbols and other objects that do not have subparts.
• Level 0 corresponds to the whole expression.
• With the option setting , Count looks at heads of expressions and their parts.
Count how many times b occurs:
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