find the nth term of the A.P. 13, 17, 1, -5, -11 .......using it find its (i) 9th term (ii) 16th term
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to find 9 term
a=13,. d=17-13=4
An=a+(n-1)d
A9=13+(9-1)4
A9=13+(8)4
A9=13+32
A9=45
to find 16 term
a=13, d=4
An=a+(n-1)d
A16=13+(16-1)4
A16=13+(15)4
A16=13+60
A16=73
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