Can u plz solve these 2 questions
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21) I guess 10 days
Don't know 22nd
Don't know 22nd
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S1 = n/2(2a + (n-1 ) d )
=na
S2=n/2( 2a + (2-1 ) d
=na+nd/2
S3=n/2(2a+(3-1)d
=na+d I'm sure this is the way but not getting answer
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