Math, asked by MitaSinha2579, 1 year ago

The 18th term of an A.P is half of its second term and 11th term exceeds one third of its 4th term by 1.find the 15th term.

Answers

Answered by Anonymous
1
let the first term be a and the common difference be d
a+17d=1/2(a+d)
2a+34d=a+d
a+33d=0 -------- equation 1
a+10d- {1/3(a+3d)=1
a+10d-(a+3d)/3=1
3a+30d-a-3d=3
2a+27d=3 -------- equation 2
2a+66d=0
2a+27d=3
=39d=-3
=d=-1/13
and a=33/13
the 15th term=a+14d
33/13+14×-1/13
33-14/13
19/13
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