Discover three numbers in A.P. whose sum is 15 and item is 80.Find the first term of an AP whose 8th and 12th terms are respectively 39 and 59.
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a+7d =39 .............1
A+11d = 59...........2
2-1
=4d=20
d= 5
A+7d =39
A+ 35 = 39
A = 39 - 35
A = 4
A 2 = a+d
= 4 +5
= 9
A3. = A+ 2d
=4+2×5
= 4+10
=14
THERE IS NO WORK OF SUM OF NUMBERS .
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