Question

4.A.P. = 7,10,13...46 का योग
होगा?

407

371

380

410​

Answer 1

Answer:

371 है इसका उत्तर।

Pehle n ki value nikalo [l=a+(n-1)d] se frr [sn=n/2(a+l)]

Answer 2

Step-by-step explanation:

Sn= n/2(a+an)

an=a+(n-1)d

46=7+(n-1)3

46=7+3n-3

n=14

Sn=14/2(7+46)

=7×53

Sn=371