Question 9
If 21998−21997−21996+21995=k.21995, then the value of k is
(a) 1
(b) 2
(c) 3
(d) 4
Given, 21998−21997−21996+21995=k.21995,
⇒21998−21997−21996+21995=k.21995⇒21995+3−21995+2−21995+1+21995×1=k.21995⇒21995[23−22−21+1]=k.21995⇒21995[8−4−2+1]=k.21995⇒3=k.2199521995⇒3=k or k=3