Evaluate the summation of 3 times negative 2 to the n minus 1 power, from n equals 1 to 5..
Asked by maham237 @ in Mathematics viewed by 316 People
A) −93.
B) −33.
C) 33.
D) 93
Answered by maham237 @
∑ ( from n = 1 to n =5 ) 3 · ( -2 ) ^( n -1 )
a 1 = 3 · ( -2 ) ^0 = 3
a 2 = 3 · ( - 2 ) = - 6
a 3 = 3 · 4 = 12
a 4 = 3 · ( - 8 ) = - 24
a 5 = 3 · 16 = 48
3 - 6 + 12 - 24 + 48 = 33
Answer: C ) 33
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