Write a formula for the nth term of each arithmetic sequence. Then use the formula to find a15. 3, 8, 13, 18
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3 , 5 , 8 , 13 are in A.P
Formula for nth term
Tn = a + (n-1)d
Tn = 3 + (n-1)*5
Tn = 5n - 2
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