Math, asked by chota26, 10 months ago

Pls let me know the answer of Q.9 pls pls ..with required solution

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Answered by genius114

1

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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