Question

Find the sum of 1+2+3+4+5+6+….…+15

Answer 1

Answer:

your answer is 120.......

Answer 2

Answer:

here's your solution

sol:

t1 = a = 1 , n = 15, d =1

By sum formula of A.P

sn = n/2 [ 2a + (n-1)d]

= 15/2 [ (2×1)+ (15 - 1) 1

= 15/2 [ 2 + (14×1)

= 7.5 [ 2 + 14]

= 7.5 [16]

= 7.5 × 16

= 120

Ans. S15 = 120.

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Thank U

------"Amannn:)))