The Total solution for NCERT class 6-12
a1 = a2 = 2, an = an-1 –1, n > 2
Given,
a1 = a2,an = an-1 – 1
Then,
a3 = a2 –1 = 2 – 1 = 1
a4 = a3 –1 = 1 – 1 = 0
a5 = a4 –1 = 0 – 1 = -1
Thus, the first 5terms of the sequence are 2, 2, 1, 0 and -1.
The correspondingseries is
2 + 2 + 1 + 0 + (-1) +……