(i) find the sum of series 2² +5² +8² +... upto 15 terms.
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the equation to find the sum of terms equals
n/2(x1+xn)
where n =no of terms
x1=first term
xn=last term
here
n=15
x1=2²
xn=42²
then we get
330²
n/2(x1+xn)
where n =no of terms
x1=first term
xn=last term
here
n=15
x1=2²
xn=42²
then we get
330²
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