kgleim14
kgleim14
09-08-2017
Mathematics
contestada
1)Find S12 for 1 + 6 + 11 + 16 +…
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koziadam
koziadam
09-08-2017
Term 12?
1 + 6 + 11 + 16 + 21 + 26 + 31 + 36 + 41 + 46 + 51 + 56
1 2 3 4 5 6 7 8 9 10 11 12
So it is 56 I believe lol
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Mehek
Mehek
09-08-2017
The rule is +5 each time
Use the formula: an = a1 + (n - 1)(d)
a1 is the first term which we have is 1 and d is the common difference which is 5 and n is the number of terms so
1 + (12 - 1)(5) = 56 is what I got
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