Decide whether following sequence is an A.P., if so find the 20th term of the
progression.
1)-12, -5, 2, 9, 16, 23, 30, ...
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a2-a1 = -5-(-12)=-5+12=7
a3-a2=2-(-5)=2+5=7
yes sequence is in AP because common difference is same.
an = a+ (n-1)d
an = -12+(20-1)7
an =-12+19×7
an =-12+133
an = 121
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