Sum of first n terms of A.P will be n2
Explanation :
n1=7
Sn=49
we know that Sn = n/2{2a+(n-1)d}
thus,
Sn1=7/2(2a+6d)=49
=14a+42d=98 ... (1) x17
n2=17
Sn2=289
Sn2=17/2(2a+16d)=289
=34a+272d=578 ....(2) x7
from eq 1 & 2
238a +714d =1666 ...
(a) Saprophytic nutrition -
Organisms feed on dead or decaying organic matter are called saprophytes and their mode of nutrition as saprophytic nutrition (In Greek- ‘Sapros’ means rotten and ‘trophos’ means...
