5th and 9th term of an ap is 34 and 55 respectively. Find out the first term of ap
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a +4d=34
a+8d=55
subrCt the equation
-4d= -21
d=21/4
substitute this value in any equation
a +4×21/4 =34
a+21=34
a=13
a+8d=55
subrCt the equation
-4d= -21
d=21/4
substitute this value in any equation
a +4×21/4 =34
a+21=34
a=13
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