Math, asked by rohanstar, 1 year ago

solve....this.... please

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Answers

Answered by SumanHoooda

1

Answer of que1) 42, 72

3) 3.9

Answered by aniket178

1

use this,
sum=n/2(2a+(n-1)d)

aniket178: the second one is no.3 not 2

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