find the sum of 10 terms whose nth term is 3n+2
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Step-by-step explanation:
an=3n+2..
a1=3+2=5
a2=3*2+2=8
:. d=8-5=3
S10=n/2 (2a +(n-1)*d)
=10/2 (2*5+(10-1)*3
=5(10+27)
=5*37
=185
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