tulasishrestha82 tulasishrestha82

15-05-2021
Mathematics

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Which term of series1 +4+7+10+...is43

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kcharuhasini7dtaksha kcharuhasini7dtaksha

17-05-2021

Answer:

a = 4

d = a2 - a1

d = 7 - 4

d = 3

an = 43

an = a + (n - 1)d

43 = 4 + (n - 1) 3

43 = 4 + 3n - 3

43 = 1 + 3n

43 - 1 = 3n

3n = 42

n = 42 ÷

n = 14

So, 14th term is 43

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