Decide whether following sequence is an A.P. , if so find the 20th term of the progression -12,-5,2,9,16,23,30,.....
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From the seequnce given below,
-12+5=7
-5-2=7
9-2=7
d=7 is constant Therefore it is an ap
t20 term=a+19d
=-12+19(7)
=12+133
=145
-12+5=7
-5-2=7
9-2=7
d=7 is constant Therefore it is an ap
t20 term=a+19d
=-12+19(7)
=12+133
=145
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