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OpenStudy (markkboyy):
find s11 for 3+1+(-1)+(-3)+.... -77 -75 -73 -71
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OpenStudy (markkboyy):
OpenStudy (aryabarus):
a= 3 r = U2-U1 = U4-U3= 1-3 = -3-(-1) = -2 so s 11 = n/2 (2a+(n-1)r) = 11/2 (2*3+ (11-1)-2) = 5.5 (6-20)=5.5 * (-14) = -77
OpenStudy (princeharryyy):
s6 = -7 s11 = (s6)*11 = -7*11 = -77
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