Question

Find the sums given below : (AP is given) 3 + 6 + 9 + ... + 150​

Answer 1

Answer:

Multiply and get answer..

Thanku

Step-by-step explanation:

a=3

D=3

An=150

An=a+(n-1)d

150=3+(n-1)3

147/3=n-1

39+1=n

N=40

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

=20(6+39*3)

=20(6+102)

=20*108

Answer 2

Step-by-step explanation:

this is an A. P series

then using formula :- sum of n numbers

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

using this identity in this sum.