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-- Mathematics - Section A
Definite Integration
$\int_{-1}^{10}sgn(x-[x])dx$ equals (where [.] denotes greatest integer function):
10
11
9
11/12
$\int\limits_{-1}^{10}sgn(\{x\})dx=11\int\limits_{0}^{1}sgn(\{x\})dx=11\int\limits_{0}^{1}1dx=11$
