Pls let me know the answer of Q.9 pls pls ..with required solution
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t1=a=25
t20=405
we have ,
tn=a+(n-1)d
t20=a+(19)d
405=25+19*d
405-25=19*d
380/19=d
d=20
Therefore common difference is 20
chota26:
It was really very helpful........
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