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# MTH101 GDB Solution & Discussion Due Date: 13 Dec. 2016

MTH101 GDB Solution & Discussion Due Date: 13 Dec. 2016

GDB No.1 (Lecture No. 13 to 19)

Question:

Starting Date: Thursday, December 8, 2016, at 12:00 A.M.

Closing Date: Tuesday, December 13, 2016 at 11:59 P.M.

Ø  Post your solution of GDB only on GDB interface of LMS.

Ø  Do not post the solution of GDB on ‘regular MDB’ forum. It will not be graded on MDB.

Ø  There is preview option available on GDB forum. So, see the preview of your solution before posting your GDB.

Ø  Once GDB is posted, it cannot be editable or re-submitted.

Ø  In case, you see boxes instead of your solution in your GDB interface then email your GDB solution at mth101@vu.edu.pk till due date.

The following will be helpful to you for inserting mathematical equations in GDB interface:

• Ø  Math Equations Writing Guide from MDB Manager.

• Ø  Please click Guideline for posting solution on GDB interface.

BEST OF LUCK!

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### Replies to This Discussion

From the question:

a1 = 1

a2 = -2

a3 = 4

n = 7

Now

Common ratio = r

r = a2/a1 = a3/a2

r = -2/1 = 4/-2 =-2

r = -2

Now sum = Sn

Sn = a1 (1-r^n) / 1-r

S7 = 1(1-(1-(-2^7)) / 1-(-2)

S7 = 1+128 / 1+2

S7 = 129 / 3

S7 = 43

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