Question Number 101871 by bemath last updated on 05/Jul/20

if a_1 = −4 , a_2 =−1 and a_n = a_(n+1) +a_(n+3 ) . find a_4 −a_1 ?

Answered by Rasheed.Sindhi last updated on 05/Jul/20

a_1 = −4 , a_2 =−1 a_n = a_(n+1) +a_(n+3 ) .......A a_4 −a_1 =? −−−−−−−−−−− n=1 A⇒a_1 =a_2 +a_4 a_4 −a_1 =−a_2 =−(−1)=1★

Commented bybemath last updated on 05/Jul/20

typo sir. a_4 −a_1 =−a_2 ?

Commented byRasheed.Sindhi last updated on 05/Jul/20

Yes sir, corrected.

Commented bymr W last updated on 05/Jul/20

we only know the terms a_1 ,a_2 ,a_4 , we can not determine the other terms.