Question

find the sum of A.P, 5+10+15.......+150​

Answer 1

Answer:

2325

Step-by-step explanation:

see attachment for your answer

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Answer 2

Step-by-step explanation:

5+10+15.......+150

a=5 , d = 10-5 =5 , n = 150

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

S150 = 150/2 ( 2×5 ( 150 - 1 ) 5)

= 75 ( 10 ( 149 ) 5 )

= 75 ( 10 + 745 )

= 75 ( 755 )

= 56625 Ans.

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