* 4. If a, 7, b, 23, C form a finite AP, find the
values of a, b and c.
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Answer:
- a=1/2, b=31/2, c=61/2
Explanation:
a=a
7=a+d
b=a+2d
23=a+3d
from
7=a+d
a=d-7
similarily,
a=3d-23
so, d-7=3d-23
15=2d
d=15/2
a=15/2-7
a=1/2
b=a+2d
=1/2+2*15/2*2
=31/2
c=a+4d
=1/2+4*15/2
=61/2
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