Find the sum of first 15 multiple of it
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2
First 15 multiple = 15.
Sum of 15 and 15 = 30.
Sum of 15 and 15 = 30.
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2
sn = n/2 ( 2a + ( n-.1) d )
sn = 15/2 ( 2*15 + (15-1) 15 )
sn = 15/2 (30 + 14*15 )
sn= 15/2 ( 30+ 210 )
sn = 15/2 *240
sn= 15*120
sn = 1800
sn = 15/2 ( 2*15 + (15-1) 15 )
sn = 15/2 (30 + 14*15 )
sn= 15/2 ( 30+ 210 )
sn = 15/2 *240
sn= 15*120
sn = 1800
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