00:01
So in the given question we have a sequence which is given by a .n is equal to minus 1 raised to the power n times minus 1 raised to the power by n minus 1 times 2 to the power n divided by 1 plus 2 to the power n.
00:27
So this is the expression the general term of the expression and we are told to find the first four terms of the sequence.
00:38
So to do that we should just substitute the value of n as 1, 2, 3 and 4.
00:44
So when n equal to 1 we have the first term which is equal to minus 1 to 1 to the power 1 minus 1 times 2 to the power 1 divided by 1 plus 1.
00:57
2 to the power 1.
00:59
So minus 1 raised to the power 1 minus 1 is 0.
01:04
So it would be equal to minus 1 raised to the power 0, which is equal to 1 times 2 to the power 1 is 2.
01:13
So 2 divided by 1 plus 2 which is equal to 2 divided by 3.
01:20
So this is the first term.
01:22
Next we have the second term which is minus 1 raised to the power 2 minus 1.
01:27
1 times 2 to the power 2 plus divided by 1 plus 2 to the power 2 which is equal to minus 1 raised to the power 1 times 2 to the power 2 is 4.
01:43
So 4 divided by 1 plus 4 which gives us minus 1 times 4 divided by 5 divided by 5...