find 9th term from the end of the ap 11,15,19,21....(20 terms)
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given
11,15,19,21 ......
a(first term)= 11
d(common difference)=15-11=4
n= 9th term from end
by formula a+(n-1)d
11+(9-1)4
11+(8)4
11+32
=43
11,15,19,21 ......
a(first term)= 11
d(common difference)=15-11=4
n= 9th term from end
by formula a+(n-1)d
11+(9-1)4
11+(8)4
11+32
=43
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