3. Find the following: (a) Sum of the first 21 terms of the sequence: 5,9, 13, 17,... (b) The sum of the first 15 terms of the sequences 7, -14, 28, —56, 112,..

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3. Find the following:
(a) Sum of the first 21 terms of the sequence: 5, 9, 13, 17,...
(b) The sum of the first 15 terms of the sequences 7, -14, 28, -56, 112,...
4. Find the following:
(a)
n
5. (Hard.) Show the following using factorials: k
= n
(x − 1).
k-
Transcribed Image Text:3. Find the following: (a) Sum of the first 21 terms of the sequence: 5, 9, 13, 17,... (b) The sum of the first 15 terms of the sequences 7, -14, 28, -56, 112,... 4. Find the following: (a) n 5. (Hard.) Show the following using factorials: k = n (x − 1). k-
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