What is the sum of following series if, the number of terms is 192.
4 + (-8) + 9 + (-10) + 11 + (-12) + ..... = ?
I can see that it is neither an arithmetic nor a geometric sequence.
Starting from n=2, taking every other n makes a sequence.
Starting at n=3, taking every other n after that also makes a sequence.
But I still can't figure out how to get to the solution. The sum is supposed to be -99.
4 + (-8) + 9 + (-10) + 11 + (-12) + ..... = ?
I can see that it is neither an arithmetic nor a geometric sequence.
Starting from n=2, taking every other n makes a sequence.
Starting at n=3, taking every other n after that also makes a sequence.
But I still can't figure out how to get to the solution. The sum is supposed to be -99.
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