Determine the Ap whose fifth term is 19 and the difference of 8 term from the 13th term is 20
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we know that nth term of an ap is a+(n-1)d
fifth term is 19
a+4d=19;
eighth term =a+7d;
thirteenth term = a+12d;
a+12d-(a+7d) = 20
5d =20;
d=4;
but
a+4d=19
a+16=19
a=3;
therefore ap is
3,7,11,15,19,23,......
fifth term is 19
a+4d=19;
eighth term =a+7d;
thirteenth term = a+12d;
a+12d-(a+7d) = 20
5d =20;
d=4;
but
a+4d=19
a+16=19
a=3;
therefore ap is
3,7,11,15,19,23,......
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