1+1/3+1/6+1/10+1/15..........15terms
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Sn = n/2 [2a + (n-1)d]
Given a = 1 , d = 1/3 - 1 = -2/3 , n = 15
S₁₅ = 15/2( 2 - 28/3 )
= 15/2 × -22/3
= -55
Given a = 1 , d = 1/3 - 1 = -2/3 , n = 15
S₁₅ = 15/2( 2 - 28/3 )
= 15/2 × -22/3
= -55
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