Asked by Ogunlakin David Oluwaseyi

The first term of an A.P is 2 and the common difference is 3. Find the sum of the first 11 terms
Answered by oobleck
S11 = 11/2 (2a+10d)
so now plug and chug
Answered by JAC OB254
Sn=n/2[2a+(n-1)d]
=11/2[2×2+(11-1)3]
=11/2[4+30]
=11/2×34
=187
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