= 
[ 2a + (n - 1)d ]
= 
[ (2 × 50) + ( - 2 × 41) ]“if s = -- [2a + (n − 1)d], find the value of s when n = 42, a = 50, d = −2.”
can someone ex...
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)
Answers: 3
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