Mathematics, 26.01.2020 00:31, shelbybibb99

“if s = -- [2a + (n − 1)d], find the value of s when n = 42, a = 50, d = −2.”
can someone explain, i got the answer from a friend, but still don’t get how to get there (answer is s=378)

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“if s = -- [2a + (n − 1)d], find the value of s when n = 42, a = 50, d = −2.”
can someone ex...