31. If 6th and 13th term of an A.P are 15 and 36 respectively the AP is
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Answered by
4
Answer:
t6= a+5d ......(1)
t13= a+12d....(2)
A/Q,
a+5d=15
a=15-5d
a+12d=36
15-5d+12d=36
7d=36-15
7d=21
d=3
a=15-5d
=15-5(3)
=15-15
=0
a+d=0+3=3
a+2d=0+2(3)=0+6=6...........
etc.
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