Question

A.P.2.5.8.11...... के 20वें और 25 वे पदो का योग निकालें।

Answer 1

Given AP;

2, 5 , 8, 11 , ........

Therefore :

• a = 2
• d = +3

Thus by using an = a + (n-1)d

1) a20 = a + (20-1)d

(2) + (19)3

6 + 57

=> a20 = 63

2)a25 = a + (25-1)d

(2) + (24)3

6 + 72

=> a25 = 78

#answerwithquality

#BAL