find the sum of the first 15 multiples of 8
Answers
Answered by
3
Question :
◾Sum of first fifteen multiples of 8.
Answer :
◾First 15 multiples of 8 are :–
Now, add them.
➛8+16+24+32+40+48+56+64+72+80+88+96+104+112+120
━━━━━━━━━━━━━━━━━━━━━━
Hence, the answer is 960
Answered by
0
Answer:
a = 8
n = 15
d = 8
So,Sn = n/2 [2a +(n-1)d)
= 15/2 (2×8 + (14)8]
= 15/2 [16 +112]
= 15/2 [128]
= 15 [64]
= 960
Similar questions