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Answer: B, D
Let’s consider each option.
A: don’t be fooled by the modulus(absolute value) sign. In this case, 1- x will be very different depending on x = -37 or 37.
B: x2 will be the same irrespective of x = -37 or 37 so 1- x2 will also be the same. SELECT
C: 1- x will be very different depending on x = -37 or 37, and so will (1 – x)2
D: x2 = |x|2 substitute any small values to check. SELECT
Solution: Don’t jump to arithmetic progression formulae
If the first number in the series was 1, then the series would have progressed as 1, 3, 5, 7, 9
9 would be the 5th term. But 9 is the 9th term so the series must have started with the previous 4 odd numbers
-7, -5, -3, -1, 1, 3, 5, 7, 9, 11
Upon addition the positive and negative terms cancel out and we are left with 9+ 11 = 20
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