We note that S(2)-S(1)=6-3=3
Thus the difference increases uniformly. This is an indication that term n is related to the square of the number of terms, n.
So the hypothesis that S(1) is related to the square of n is true, namely
So figure out which answer is correct.
For 3, 5, 7 increases by 2
so in the equation this is (+2)
or is does that mean that n is squared?
S(4)-4²=18-16=2 this determines that it is (+2)in the equation?
or the other way around?
S(4)=4²+2, and in general,the rule is:
Check for cases n=2,3 and 4.
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