Question

1.in an AP if a = 20, d = 40.4, n = 10, find s. (or)
2.A = {x : x E N and x. < 3}
B = {x : x is a prime factor of 105), find A U B.give the two problems answers
​

Answer 1

Step-by-step explanation:

a=20 ; d=40.4 ; n=10

an=a+(n-1)d

an=20+(10-1)40.4

an=20+9*40.4

an=20+363.6 》383.6.

S10=10/2(a+an)

S10=5(20+383.6)

S10=5*403.6 》2018.