Question

find the sum of 30 number of ap,1+5+9+13+..... find the 58 term of the ap 0,5,10,15​

Answer 1

Step-by-step explanation:

We know that

Sn= n/2[ (2a + (n - 1)d]

here

a=1 d= 4 n= 30

S 30 = 30/2 [ 2(1) + (30-1) 4]

S 30 = 15 [ 2+29 ×4]

S 30 = 15 × 118

S 30 = 1770

Answer 2

Step-by-step explanation:

a=1,d=5-1=4 , n=30

Sn=n/2(2a+(n-1)d)

S30=30/2(2*1+(30-1)4)

=15(2+29*4)

=15(2+116)

=15(118)

=1770.

a=0,d=5, n=58

an=a+(n-1)d

a58= 0+(58-1)5

=57*5

= 285.