which term of sequence 3 , 7, 11,...... is 79
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25 th term
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Answer:
a = 3
d = 7-3= 4
an = a+ (n-1)d
79 = 3 + (n-1)4
79 - 3 = (n-1)4
76/4 = n-1
76/4 +1 = n
n = 80/4
n = 20
20th term
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