1.

9. Find the sum of first 20 terms of the AP 5, 13, 21,​

Answer»

ong>Answer:

157

Step-by-step EXPLANATION:

a= 5 , d= 8 , n= 20

an = a + (n-1)d

a20 = 5 + (20-1)8

= 5 + (19)8

= 5 + 152

= 157



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