Find the value of the expression: 1 - 4 + 5 - 8 . . . to 50 terms.
1] -150 2] -75 3] -50 4] 75

• Expression becomes:- (1-4)+(4-8)+.....to 50 terms = -3-3-3......25 terms
  therefore it is in AP with common difference as 0.
  Therefore sum = (25/2) ((2*(-3) + (25-1)*0) = (25/2) * (-6) = -75. (Option 2)
• 6 years agoHelpfull: Yes(2) No(0)