find the aum of first eleven terms whose first term is 16 and d = - 5
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Step-by-step explanation:
term n= 11
a = 16
d = -5
Sn = n/2 [ 2a + ( n - 1) x d ]
= 11/2 [ 2 x 16 + ( 11-1 ) x -5]
= 11/2 [ 32 + 10 x -5 ]
= 5.5 [ 32 -50 )
= 5.5 - 18
= - 12.5
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