i don't know weather its grouped correctly(sorry)

for if

then which of the following are true(multiple choice)

(A)

(B)

(C)

(D)

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- Sep 3rd 2010, 09:27 AMgrgrsanjayooh a tricky question
i don't know weather its grouped correctly(sorry)

for if

then which of the following are true(multiple choice)

(A)

(B)

(C)

(D) - Sep 3rd 2010, 10:33 AMwonderboy1953
You may try using mathematical induction.

- Sep 3rd 2010, 06:23 PMgrgrsanjay
THE ACTUAL TIME GIVEN FOR PROBLEM IS 3 MINUTES using mathematical induction it takes 10 minutes at least

i think we should expand it and take the G.P sum of n terms and do something might work

this is a tricky sum for me :(:( - Sep 4th 2010, 12:58 AMOpalg
- Sep 4th 2010, 05:11 AMgrgrsanjay
oh sorry it was just a typing error i corrected the question actually it sin to the power of 2n

- Sep 4th 2010, 06:38 AMOpalg
- Sep 4th 2010, 07:24 AMgrgrsanjay
yea i got (A) correct so any other options are correct??? but when substitute a value (C) and (D) also seem correct to me

- Sep 4th 2010, 07:27 AMundefined
- Sep 4th 2010, 10:10 AMggn
- Sep 4th 2010, 10:24 AMundefined
Yes thank you I can read, my point is that in a valid multiple choice question it's not possible to have more than one correct option, therefore if A is correct then B,C,D are automatically incorrect. If the OP wanted to call into question the validity of the problem, the OP could have specified that.

- Sep 4th 2010, 10:43 AMOpalg
- Sep 5th 2010, 05:32 AMgrgrsanjay
yea but how to prove (C) and (D) are correct?? tell me please

- Sep 5th 2010, 06:54 AMOpalg
- Sep 5th 2010, 07:01 AMgrgrsanjay
what have you used to get that formula??

- Sep 5th 2010, 07:07 AMOpalg