the third term of ap is 3 and 11th tem is -21. find the first term and common difference
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third term=3
11th term=-21
then
a+2d=3
a+10d=-21
on subtracting these equation we get
8d=16
d=23
then a=3-2×2
a = -1
11th term=-21
then
a+2d=3
a+10d=-21
on subtracting these equation we get
8d=16
d=23
then a=3-2×2
a = -1
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