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Question
Which term of the progression 4 + 8 + 12 + ... is 76?
Sum
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Solution
a = 4
d = 8 − 4
d = 4
an = 76
an = a + (n − 1)d
76 = 4 + (n − 1)4
76 = 4 + 4n − 4
76 = 4n
n = `76/4`
n = 19
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