find the 16th term of AP :7 , 14 , 21
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a = 7
d= 14 -7=7
n = 16
therefore, by formula,
an = a +(n-1) d
a16 = 7 + (16-1) 7
a16 = 7 + 105
a16 = 112
therefore, the 16th term of the given AP.
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