Math, asked by nidhi411, 1 year ago

plz plz its urgent plz

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Answered by GarvitBelwal

0

it's because of the formula
a,n. = a +(n-1)d

Answered by Anonymous

1

since its common diff. is 4 so if a20 is x then a30 will be x+40 so their diff will be 40

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