What is the sum of the integers from -170 to 171, inclusive?  Choose the correct choice from the following choices:
A) 181
B) 171
C) 191
D) 201
E) 202
in an arithmetic progression,   the nth term is given by tn=a+(n-1)d   here tn=171, a=-170, d=1   hence, 171=-170+(n-1)   or n=342   Sum of n terms can be calculated by sn=n/2(a+l)   a=first term, l=last term, n=no. of terms   sn=342*(-170+171)/2   sn=342*1/2= 
<gadget id="calculator">342*1/2</gadget>
<output>171</output>
171   Answer : 171
<result>B</result>
What is the sum of the integers from -170 to 171, inclusive?