If a=2 b=1 find the value of a square minus b square​

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241. a) 0 b) 1 c) 2 d) 1 2

Which statements about these triangles is true