(ii) Find the sum of 5+8+11+....to 10 terms using the formula.
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a=5
d=8-5=3
n=10
sn=?
using formula
sn=n/2{2a+(n-1)d}
=10/2{2(5)+(20-1)3}
=5{10+(9)3}
=5(10+27)
=5(37)
sn= 185.
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