Math, asked by poonamgarg63, 5 hours ago

find sum of
15 + 11 +7+ ... + (-13)

....

plz help me....​



this is a question of chapter ap....​

Answers

Answered by nituarya312
0

Answer:

15+11+7=39 achcha question hai aur iska answer first wali digit se nain ko dheere dheere karke -13 ke piche le jao aur jo answer bachega vah tumhara answer hoga

Answered by shrirampawar249
0

Answer:

a=15

d=11-15=-4

an=-13

an = a + (n - 1)d \\  - 13 = 15 + (n - 1) - 4 \\  - 13 = 15 - 4n + 4 \\ 4n = 15 + 4 + 13 \\ 4n = 32 \\ n = 8 \\ s8 =  \frac{8}{2} (a + an) \\  = 4(15 - 13) \\  = 4 \times 2 \\  = 8

sum of ap is 8

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