For an arithmetical sequence, the first term is 2 and the...
For an arithmetical sequence, the first term is 2 and the common difference is 3. Find the sum of the first 11 terms
157
187
197
200
Correct answer is B
a = 2, d = 3 and n = 11
To find Sn/sub> = n2 [2a + (n - 1) δ]
= 112 [2(2) + (11 - 1) 3]
= 112n [4 + 10(3)]
= 112(34)
= 11 x 17
= 187
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