Find the sum of the first 11 terms of the arithmetic sequence 1, 3, 5, . . . .
A) 121
B) 144
C) 100
D) 132

Name: Find the sum of the first 11 terms of the arithmetic sequence 1, 3, 5, . . . . A) 121 B) 144 C) 100 D) 132
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The sequence is arithmetic with the first term a = 1 and common difference d = 2. The sum of the first n terms of an arithmetic sequence is given by S_n = n/2 * (2a + (n-1)d). For the first 11 terms, S_11 = 11/2 * (2*1 + (11-1)*2) = 11/2 * (2 + 20) = 11/2 * 22 = 121.

Find the Sum of the First 11 Terms of the Arithmetic