if the third term of an ap is 12and 10th term is 26then its 20th term is
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Answer:
an=a+(n-1) d
a3=12 .. a10=26
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Answered by
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Answer:
a3=12
a+2d=12...(1)
a10=26
a+9d=26.......(2)
subtracting (1) and (2)
a+9d-a-2d=26-12
7d=14
d=2
a+2(2)=12
a=8
a20=a+19d
=8+19*2
=46
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