Math, asked by joshua004, 6 months ago

find the sum of first 5 multiplies of 8​

Answers

Answered by deepkaur6956
1

Step-by-step explanation:

The multiplies of 8 are 8,16, 24,32......

These are in an A. P., haveing first term as 8 and common difference as 8

Therefore, a=8, d=8, S15=?

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

S15=15/2(2*8+(15-1)8)

=15/2(16+(14)8)

=15*128/2

=960

Similar questions