Find a23 - a13 for the A.P : - 9,-14,-19,-24,-------------
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Given serious;
9, -14, -19, -24.................
here
a = 9
a2= -14
a3= -19
d= a3-a2
d= -19-(-14)
d= -5
a13 = a+12d
= 9+12(-5)
= 9-60
= -51
a23= a+22d
= 9+ 22(-5)
= 9- 110
= -101
a23 - a13
= -101-(-51)
= -101 + 51
= -50
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