Find the sum of 1st 8 multiples of 3 ?
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The sum of first 8 multiples of 3 forms an A.P. because of the same common difference.
The A.P goes like : 3, 6, 9... 24
a= 3, an= 24, n=8
Sn= n/2 ( a + an)
= 8/2 ( 3 + 24)
= 4 (27)
= 108
The A.P goes like : 3, 6, 9... 24
a= 3, an= 24, n=8
Sn= n/2 ( a + an)
= 8/2 ( 3 + 24)
= 4 (27)
= 108
manavlodha002:
108
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4
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